GB2215041A - Sorting and/or confirming the identity of gems - Google Patents
Sorting and/or confirming the identity of gems Download PDFInfo
- Publication number
- GB2215041A GB2215041A GB8901759A GB8901759A GB2215041A GB 2215041 A GB2215041 A GB 2215041A GB 8901759 A GB8901759 A GB 8901759A GB 8901759 A GB8901759 A GB 8901759A GB 2215041 A GB2215041 A GB 2215041A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gem
- gems
- characteristic
- fluorescent emission
- identity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000010437 gem Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 claims description 19
- 230000005670 electromagnetic radiation Effects 0.000 claims description 17
- 230000005855 radiation Effects 0.000 claims description 5
- 230000003595 spectral effect Effects 0.000 abstract description 3
- 239000010432 diamond Substances 0.000 description 21
- 229910003460 diamond Inorganic materials 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 3
- 238000001429 visible spectrum Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000579895 Chlorostilbon Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- UIZLQMLDSWKZGC-UHFFFAOYSA-N cadmium helium Chemical compound [He].[Cd] UIZLQMLDSWKZGC-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
- B07C5/3425—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain
- B07C5/3427—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain by changing or intensifying the optical properties prior to scanning, e.g. by inducing fluorescence under UV or x-radiation, subjecting the material to a chemical reaction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/87—Investigating jewels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
- G01J3/4406—Fluorescence spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/845—Objects on a conveyor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6489—Photoluminescence of semiconductors
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Sorting Of Articles (AREA)
Abstract
Gems 2 are sorted or identified according to their fluorescent properties by illuminating the gems e.g. with UV light from a source 3 and detecting one or more characteristic fluorescent emissions e.g. using a spectral analyser 4. Gems on a conveyor 8 may be directed into different receptacles 7 depending on their fluorescent properties. <IMAGE>
Description
METHOD OF ANtAPPARATUS FOR SORTING AND/OR CONFIRMING THE IDENTITY OF GEMS
This invention relates to a method of and an apparatus for sorting and/or confirming the identify of gems. More particularly, the present invention relates to a method of and an apparatus for sorting and/or confirming the identify of gems before and after a processing operation.
There are several processes involved between extracting a mineral from the ground to producing a polished, faceted gem. The process by which the value increases by the greatest amount is that of cutting and polishing whereby the gem is transformed from its irregular, rough shape into the faceted condition which is suitable for jewellery.
The cutting and polishing operation is a specialist process for which there are dedicated factories around the world. These factories generally receive batches of rough gems from a merchant, the factory cuts and polishes the batches and then returns them to the merchant who pays for the processing.
Because there is no resemblance between the goods before entering and after leaving the polishing factories, this has provided an avenue for unscrupulous polishers to switch the gems for less valuable ones. In the case of diamonds, it is considered that typically 10% of the value of a batch of gems is lost by substitution.
Hitherto gem merchants have been unable to determine whether the polished gems that they are receiving back from a polisher are those that were delivered.
It is an object of the present invention to provide a method of and an apparatus for alleviating the problems described above.
We have found that gems can adequately be sorted, classified or identified by means of characteristics of the fluorescent emissions of gems caused when the gems are illuminated with appropriate electromagnetic radiation, such as visible light in the blue or green region of the spectrum or ultraviolet light. fn this regard, we have found that the fluorescent emissions of the gems, in almost all instances, are a bulk property of the gems and are unaffected by the cutting and polishing process.
References in the specification to gems includes reference to diamonds, emeralds, sapphires and any other gems which emit fluorescence when illuminated by electromagnetic radiation.
In one aspect the invention provides a method of sorting gems comprising the steps of;
(a) illuminating the gems with electromagnetic radiation to cause the gems to fluoresce;
(b) measuring one or more characteristic of the fluorescent emission; and
(c) sorting the gems on the basis of said characteristic(s).
The measured characteristic(s) may include the wavelength or the intensity of the fluorescent emission.
The method may further include sorting the gems on the basis of gem type, size or other characteristic or a combination of two or more of such characteristics.
A further aspect of the invention provides a method of confirming the identify of a gem following processing, comprising the steps of;
(a) prior to said processing, illuminating the gem with electromagnetic radiation to cause the gem to fluoresce;
(b) detecting one or more characteristic of the resultant fluorescent emission;
(c) following processing, illuminating the said gem with electromagnetic radiation to cause the gem to fluoresce;
(d) detecting the one or more said characteristic of the fluorescent emission; and
(e) comparing the one or more said characteristic of the fluorescent emissions prior to and following processing thereby to confirm the identity of said gem following processing.
A further aspect of the invention provides a method of confirming the identity of gems in a parcel of gems following processing, each gem in the parcel having substantially the same value of a characteristic of the fluorescent emission of the gems when the gems are illuminated by electromagnetic radiation, comprising the steps of;
(a) following processing, illuminating said parcel of gems with electromagnetic radiation (b) detecting the fluorescent emission of the gems; and
(c) examining the said characteristic of each gem to determine whether the value of the said characteristic is different to that exhibited by the bulk of the parcel thereby to confirm the identity of the gems in the parcel.
fn another form the invention provides an apparatus for sorting gems into parcels, with each gem in a given parcel having a common fluorescence characteristic, said apparatus comprising:
(a) a feed system to move the gems along a path;
(b) a radiation source to irradiate the gems as the gems move along the path;
(c) a detector system to determine a characteristic of the fluorescent emission of each gem; and
(d) an ejector system responsive t the fluorescent emission characteristic of ihe gems to deliver each gem to one of a plurality of receptacles thereby to form parcels of gems.
In another form the invention provides an apparatus for confirming the identity of a gem following processing, said apparatus comprising:
(a) a feed system to move the gem along a path;
(b) a radiation source to irradiate the gem as the gem moves along the path;
(c) a detector system to determine a characteristic of the fluorescent emission of the gem; and
(d) an ejector system responsive to the fluorescent emission characteristic of the gem to deliver the gem to one of a plurality of receptacles,
whereby, in use, a comparison of the fluorescent emission characteristic of a gem prior to and after processing is a means of confirming the identity of the gem.
The invention is described further with reference to Figure 1 which is a schematic illustration of a preferred embodiment of an apparatus for sorting gems into parcels and for confirming the identity of gems in accordance with the invention.
Referring to the figure, a feed system 1, in the form of a vibratory hopper, delivers a single file 2 of rough diamonds onto a conveyor 8 which carries the diamonds through a beam of electromagnetic radiation emitted by a source 3.
In alternative embodiments the diamonds may be transported through the beam by gravitational free fall or by means of a vacuum wheel.
The source 3 of electromagnetic radiation may be a mercury or xenon lamp or a laser such as a helium-cadmium laser emitting ultraviolet light.
Under ultraviolet light a diamond may fluoresce light corresponding to any colour in the visible spectrum, although the majority of diamonds fluoresce a blue or greenish colour. In order to sort, classify or identify the diamonds, an appropriate characteristic of the fluorescent emission may be specific wavelengths in the emitted spectrum or the intensity of the emission.
The source 3 of electromagnetic radiation may emit light in the visible spectrum, for example, in the blue or green region of the spectrum.
Under illumination by light in the visible spectrum a diamond may fluoresce and the fluorescent emission of the illuminated diamonds may be detected through a filter which prevents transmission of the wavelengths of the source 3. In order to sort, classify or identify the diamonds, an appropriate characteristic ef the fluorescent emission may be specific wavelengths in the emitted spectrum or the intensity of the emission.
Generally speaking it is desirable to have a filter on the output of the source 3 of electromagnetic radiation in order to select a specific wavelength of the electromagnetic radiation. For a mercury lamp is has be found there are useful strong emissions at wavelengths of about 245, 310 and 360 micrometers. Any of these wavelengths may be used, however, it may be that greater discrimination can be achieved with a particular one of these wavelengths.
Some of the fluorescent radiation emitted from a diamond under illumination passes through a detector 4 such as a spectral analyser (such as a scanning monochromator) or a colour filter arrangement that includes one or more photodetectors.
The signal from the spectral analyser or the photodetectors passes into a processor 5 which is pre-programmed to -determine the parcel for.the diamond on the basis of the value of an appropriate characteristic of the fluorescent emission of the diamond.
An ejector 6 directs the diamond i.nto one of several receptacles 7 on the basis of the predetermined value, each receptacle 7 thereby containing a parcel of diamonds with each diamond having the same value of the characteristic of the fluorescent emission. The ejector 6 may be of any suitable form such as an air jet or a flapper gate system.
Other optical and mechanical arrangements may be used to achieve the same objective as the preferred embodiment described above but which none the less fall within the spirit of the invention.
In addition to sorting rough diamonds into parcels the apparatus described above could be used to confirm the identity of diamonds, either separately or in parcels, following processing. In this regard, if the diamonds have not been interfered with during processing they should be delivered to the same receptacle to which they were delivered prior to processing.
It is evident from the foregoing that the invention provides a simple and effective means by which the substitution of diamonds or other gems during the cutting and polishing process can be detected.
Claims (12)
1. A method of sorting gems, comprising the steps of:
(a) illuminating the gems with electromagnetic radiation to cause the gems to fluoresce;
(b) detecting one or more characteristic of the fluorescent emission; and
(c) sorting the gems on the basis of said characteristic (5).
2, The method of Claim 1, wherein said characteristic is one or more of the wavelengths of the 'fluorescent emission.
3. The method of Claim 1 or Claim 2, wherein said characteristic is the intensity of one or more of the wavelengths of the fluorescent emission.
4. The method of any one of Claims 1 to 3, wherein the sorting step (c) further comprises sorting on the basis of gem type and/or gem size.
5. A method of confirming the identity of a gem following processing, comprising the steps of;
(a) prior to processing, illuminating the gem with electromagnetic radiation to cause the gem to fluoresce;
(b) detecting one or more characteristic of the fluorescent emission;
(c) following processing, illuminating the gem with electromagnetic radiation to cause the gem to fluoresce;
(d) detecting the said one or more characteristic of said fluorescent emission; and (e) comparing the one or more said characteristic of the fluorescent emissions thereby to confirm the identity of the gem following processing.
6. A method of confirming the identity of gems in a parcel of gems following processing, each gem in the parcel having substantially the same value of a characteristic of the fluorescent emission of the gems when the gems are illuminated by electromagnetic radiation, comprising the steps of;
(a) following processing, illuminating said parcel of gems with electromagnetic radiation;
(b) detecting fluorescent emission of the gems;
(c) examining the said characteristic of each gem to determine whether the value of said characteristic is different to that exhibited by the bulk of the parcel thereby to confirm the identity of the gems in the parcel.
7. An apparatus for sorting gems into parcels with each gem in a given parcel having a common fluorescence characteristic, said apparatus comprising:
(a) a feed system to move the gems along a path;
(b) a radiation source to irradiate the gems as the gems move along the path;
(c) a detector system to determine a characteristic of the fluorescent emission of each gem; and
(d) an ejector system responsive to the fluorescent emission characteristic of the gems to deliver each gem to one of a plurality of receptacles thereby to form parcels of gems.
8. An apparatus for confirming the identity of a gem, comprising:
(a) a feed system to move the gem along a path;
(b) a radiation source to irradiate the gem as the gem moves along the path;
(c) a detector system to determine a characteristic of the fluorescent emission of the gem; and
(d) an ejector system responsive to the fluorescent emission characteristic of the gem, to deliver the gem to one of a plurality of receptacles,
whereby, in use, a comparison of the fluorescent.emission characteristic of a gem prior te and after processing is a means of confirming the identity of the gem.
9. A method of sorting gems substantially as hereinbefore described with reference to the accompanying drawing.
10. A method of confirming the identity of a gem substantially as hereinbefore described with reference to the accompanying drawing.
11. An apparatus for sorting gems substantially as hereinbefore described with reference to the accompanying drawing.
12. An apparatus for confirming the identity of a gem substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPI647788 | 1988-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8901759D0 GB8901759D0 (en) | 1989-03-15 |
| GB2215041A true GB2215041A (en) | 1989-09-13 |
Family
ID=3772749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8901759A Withdrawn GB2215041A (en) | 1988-01-29 | 1989-01-27 | Sorting and/or confirming the identity of gems |
Country Status (6)
| Country | Link |
|---|---|
| CN (1) | CN1037966A (en) |
| AU (1) | AU2889289A (en) |
| BE (1) | BE1002936A4 (en) |
| GB (1) | GB2215041A (en) |
| IL (1) | IL89100A0 (en) |
| ZA (1) | ZA89663B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425426A2 (en) * | 1989-10-27 | 1991-05-02 | Wellborn Ltd. | Method for identifying gemstones, particularly diamonds |
| US5124935A (en) * | 1990-11-30 | 1992-06-23 | Omphalos Recovery Systems Inc. | Gemstone identification, tracking and recovery system |
| GB2303699A (en) * | 1995-07-24 | 1997-02-26 | Gersan Ets | A method and apparatus for detecting layers of synthetic diamond |
| US5801819A (en) * | 1994-09-02 | 1998-09-01 | Gersan Establishment | Distinguishing natural from synthetic diamond |
| US5811824A (en) * | 1994-01-25 | 1998-09-22 | Gersan Establishment | Method and an apparatus for testing whether a diamond has a layer of synthetic diamond deposited thereon |
| US5835200A (en) * | 1990-04-24 | 1998-11-10 | Gersan Establishment | Method and apparatus for examining an object |
| US5883389A (en) * | 1993-03-05 | 1999-03-16 | Spear; Paul Martyn | Distinguishing natural from synthetic diamonds |
| EP0772037A3 (en) * | 1991-02-20 | 1999-08-18 | Gersan Establishment | Procedure and equipment for classifying or sorting of minerals |
| US5983238A (en) * | 1997-12-26 | 1999-11-09 | Diamond Id | Gemstons identification tracking and recovery system |
| EP1228359A1 (en) | 1999-10-29 | 2002-08-07 | General Electric Company | Method of detection of natural diamonds that have been processed at high pressure and high temperatures |
| GB2504052A (en) * | 2012-03-16 | 2014-01-22 | De Beers Centenary AG | Diamond and boart sorting system |
| GB2554467A (en) * | 2016-09-30 | 2018-04-04 | De Beers Uk Ltd | Apparatus for sorting gemstones |
| US10036711B2 (en) | 2014-05-27 | 2018-07-31 | Gemological Appraisal Association, Inc. | Gemstone registration and recovery system, and systems for evaluating the light performance of a gemstone and capturing forensic characteristics of a gemstone |
| WO2022162634A1 (en) * | 2021-02-01 | 2022-08-04 | Sarine Technologies Ltd. | System and method for characterizing gemstones using fluorescence |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE99196T1 (en) * | 1988-09-08 | 1994-01-15 | De Beers Ind Diamond | SORTING DEVICE. |
| GB2500259A (en) * | 2012-03-16 | 2013-09-18 | De Beers Centenary AG | Gemstone inspection |
| CN107144519A (en) * | 2017-05-24 | 2017-09-08 | 中山市滔略生物科技有限公司 | Cellanalyzer hemolytic agent and preparation method thereof |
| CN107941679A (en) * | 2017-11-22 | 2018-04-20 | 中山市创艺生化工程有限公司 | A kind of reagent for hemocyte analyzers |
| CN108872225A (en) * | 2018-07-17 | 2018-11-23 | 浙江亚培生物技术有限公司 | A kind of detection reagent and detection method detecting animal blood cell |
| CN109142196A (en) * | 2018-08-18 | 2019-01-04 | 山东博科生物产业有限公司 | Three classification reagent for hemocyte analyzers of one kind |
| CN109480414B (en) * | 2018-12-27 | 2024-02-06 | 深圳市合尔为科技有限公司 | Diamond loading attachment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1384813A (en) * | 1971-02-12 | 1975-02-26 | De Beers Cons Mines Ltd | Separation of diamonds by electromagnetic radiation |
| GB2013335A (en) * | 1978-01-31 | 1979-08-08 | De Beers Ind Diamond | Diamond detection |
| GB2073410A (en) * | 1980-02-22 | 1981-10-14 | Debex Pty Ltd | Recovering particulate materials from mixtures containing them |
| EP0071462A1 (en) * | 1981-07-27 | 1983-02-09 | Lce, Ltd. | Method and apparatus for analyzing gems |
| GB2107861A (en) * | 1981-10-23 | 1983-05-05 | De Beers Ind Diamond | Particulate sorting apparatus |
| GB2121535A (en) * | 1982-06-02 | 1983-12-21 | Anglo Amer Corp South Africa | Detector for use in sorting system |
| GB2199675A (en) * | 1986-12-31 | 1988-07-13 | Samsung Electronics Co Ltd | Tableware washer control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2199657B (en) * | 1986-11-12 | 1990-12-12 | De Beers Ind Diamond | Diamond sorting |
-
1989
- 1989-01-27 AU AU28892/89A patent/AU2889289A/en not_active Abandoned
- 1989-01-27 IL IL89100A patent/IL89100A0/en unknown
- 1989-01-27 GB GB8901759A patent/GB2215041A/en not_active Withdrawn
- 1989-01-27 ZA ZA89663A patent/ZA89663B/en unknown
- 1989-01-27 BE BE8900087A patent/BE1002936A4/en not_active IP Right Cessation
- 1989-01-28 CN CN89101410A patent/CN1037966A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1384813A (en) * | 1971-02-12 | 1975-02-26 | De Beers Cons Mines Ltd | Separation of diamonds by electromagnetic radiation |
| GB2013335A (en) * | 1978-01-31 | 1979-08-08 | De Beers Ind Diamond | Diamond detection |
| GB2073410A (en) * | 1980-02-22 | 1981-10-14 | Debex Pty Ltd | Recovering particulate materials from mixtures containing them |
| EP0071462A1 (en) * | 1981-07-27 | 1983-02-09 | Lce, Ltd. | Method and apparatus for analyzing gems |
| GB2107861A (en) * | 1981-10-23 | 1983-05-05 | De Beers Ind Diamond | Particulate sorting apparatus |
| GB2121535A (en) * | 1982-06-02 | 1983-12-21 | Anglo Amer Corp South Africa | Detector for use in sorting system |
| GB2199675A (en) * | 1986-12-31 | 1988-07-13 | Samsung Electronics Co Ltd | Tableware washer control |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425426A2 (en) * | 1989-10-27 | 1991-05-02 | Wellborn Ltd. | Method for identifying gemstones, particularly diamonds |
| US5118181A (en) * | 1989-10-27 | 1992-06-02 | Wellborn Ltd. | Method and apparatus for identifying gemstones, particularly diamonds |
| EP0425426A3 (en) * | 1989-10-27 | 1993-05-19 | Wellborn Ltd. | Method for identifying gemstones, particularly diamonds |
| US5835200A (en) * | 1990-04-24 | 1998-11-10 | Gersan Establishment | Method and apparatus for examining an object |
| US5124935A (en) * | 1990-11-30 | 1992-06-23 | Omphalos Recovery Systems Inc. | Gemstone identification, tracking and recovery system |
| EP0772037A3 (en) * | 1991-02-20 | 1999-08-18 | Gersan Establishment | Procedure and equipment for classifying or sorting of minerals |
| US5883389A (en) * | 1993-03-05 | 1999-03-16 | Spear; Paul Martyn | Distinguishing natural from synthetic diamonds |
| US5811824A (en) * | 1994-01-25 | 1998-09-22 | Gersan Establishment | Method and an apparatus for testing whether a diamond has a layer of synthetic diamond deposited thereon |
| US5801819A (en) * | 1994-09-02 | 1998-09-01 | Gersan Establishment | Distinguishing natural from synthetic diamond |
| GB2303699A (en) * | 1995-07-24 | 1997-02-26 | Gersan Ets | A method and apparatus for detecting layers of synthetic diamond |
| US5983238A (en) * | 1997-12-26 | 1999-11-09 | Diamond Id | Gemstons identification tracking and recovery system |
| EP1228359A1 (en) | 1999-10-29 | 2002-08-07 | General Electric Company | Method of detection of natural diamonds that have been processed at high pressure and high temperatures |
| EP1228359B1 (en) * | 1999-10-29 | 2007-09-12 | Bellataire International LLC | Method of determining whether a natural diamond has been processed at high pressure and high temperature |
| GB2504052A (en) * | 2012-03-16 | 2014-01-22 | De Beers Centenary AG | Diamond and boart sorting system |
| GB2504052B (en) * | 2012-03-16 | 2017-05-10 | De Beers Uk Ltd | Sorting aggregate material |
| US10036711B2 (en) | 2014-05-27 | 2018-07-31 | Gemological Appraisal Association, Inc. | Gemstone registration and recovery system, and systems for evaluating the light performance of a gemstone and capturing forensic characteristics of a gemstone |
| GB2554467A (en) * | 2016-09-30 | 2018-04-04 | De Beers Uk Ltd | Apparatus for sorting gemstones |
| AU2017335245B2 (en) * | 2016-09-30 | 2019-05-23 | De Beers Uk Limited | Apparatus and method for sorting gemstones |
| US11020771B2 (en) | 2016-09-30 | 2021-06-01 | De Beers Uk Ltd | Apparatus for sorting gemstones |
| WO2022162634A1 (en) * | 2021-02-01 | 2022-08-04 | Sarine Technologies Ltd. | System and method for characterizing gemstones using fluorescence |
| US11892413B2 (en) | 2021-02-01 | 2024-02-06 | Sarine Technologies Ltd. | System and method for characterizing gemstones using fluorescence |
Also Published As
| Publication number | Publication date |
|---|---|
| IL89100A0 (en) | 1989-08-15 |
| CN1037966A (en) | 1989-12-13 |
| AU2889289A (en) | 1989-08-10 |
| ZA89663B (en) | 1989-10-25 |
| BE1002936A4 (en) | 1991-09-03 |
| GB8901759D0 (en) | 1989-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2215041A (en) | Sorting and/or confirming the identity of gems | |
| AU590146B2 (en) | Separation process for diamonds | |
| EP1189709B1 (en) | Method and device for sorting products | |
| CN1121282C (en) | Method and apparatus for sorting product | |
| EP0772037B1 (en) | Procedure and equipment for classifying or sorting of minerals | |
| AU716000B2 (en) | High throughput sorting system | |
| AU644715B2 (en) | Process for the qualitative analysis of plastic particles | |
| RU2623987C2 (en) | Breed assortment | |
| JP5724067B2 (en) | Method and apparatus for sorting potato products | |
| US4799786A (en) | Method of diamond identification | |
| JPH07155702A (en) | Grain color sorting device | |
| JPH11156310A (en) | Article classifying method and apparatus | |
| US4875771A (en) | Method for assessing diamond quality | |
| CN1129615A (en) | Cereal grain color sorting apparatus | |
| JP2020504673A (en) | Classification of gemstones | |
| JPH06258138A (en) | Method for identification of object and apparatus for execution of said method | |
| CA2136779A1 (en) | Process for the optical sorting of bulk material | |
| KR20240118126A (en) | MATERIAL IDENTIFICATION APPARATUS AND METHOD | |
| CN115999943A (en) | Nonmetal ore sorting facilities | |
| GB2219080A (en) | Identifying gemstones | |
| GB2280956A (en) | Detecting diamonds in a plurality of objects | |
| JP3058196U (en) | Sorting device | |
| US20130228498A1 (en) | Method for detection of contaminated objects | |
| JPS5914561B2 (en) | Cocoon selection method | |
| RU2780053C1 (en) | Line with an optical system for identifying macro- and microdamages in tissues of root crops and apples |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |