EP1694155B1 - Pierre precieuse a facettes - Google Patents

Pierre precieuse a facettes Download PDF

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Publication number
EP1694155B1
EP1694155B1 EP03782009A EP03782009A EP1694155B1 EP 1694155 B1 EP1694155 B1 EP 1694155B1 EP 03782009 A EP03782009 A EP 03782009A EP 03782009 A EP03782009 A EP 03782009A EP 1694155 B1 EP1694155 B1 EP 1694155B1
Authority
EP
European Patent Office
Prior art keywords
stone
facets
gemstone
surface area
light
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.)
Expired - Lifetime
Application number
EP03782009A
Other languages
German (de)
English (en)
Other versions
EP1694155A1 (fr
Inventor
Michel Abittan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Abittan Abrasives & Colour Me & Drop-A-Diamond & Pearl Of Diamond & Faceted Rocks 100% Diamond
Original Assignee
Abittan Abrasives & Colour Me & Drop-A-Diamond & Pearl Of Diamond & Faceted Rocks 100% Diamond
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Abittan Abrasives & Colour Me & Drop-A-Diamond & Pearl Of Diamond & Faceted Rocks 100% Diamond filed Critical Abittan Abrasives & Colour Me & Drop-A-Diamond & Pearl Of Diamond & Faceted Rocks 100% Diamond
Publication of EP1694155A1 publication Critical patent/EP1694155A1/fr
Application granted granted Critical
Publication of EP1694155B1 publication Critical patent/EP1694155B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C17/00—Gems or the like
    • A44C17/001—Faceting gems

Definitions

  • the present invention relates to a gemstone having a surface at least part of which is polished, according to the preamble of the first claim.
  • the technique of polishing gemstones, for example diamonds, by cutting the surface of the diamond is well known in the art.
  • the surface of the diamond is cut to show a specific number of facets, the facets having determined shapes and sizes and extending under well defined angles with respect to each other.
  • the diamond is cut to show along the top of the stone a crown with a table, a girdle surrounding the crown, and below the girdle a plurality of pavilion facets which point to the culit.
  • the internal brilliance of the stone, the dispersion of the light by the stone and the amount of light reflected by the stone determine the quality of the cut and of the stone.
  • the stone further comprises a lower portion containing 4 lower part facets forming an isosceles triangle.
  • Four groups of narrow additional facets extend from the four corners of the girdle plane between the lateral edges of the lower part facets.
  • the angle between each of the upper part facets and the girdle plane is between 23° and 30° and the angle between each of the lower part facets and the girdle plane is between 34° and 43°.
  • US-A-6.006.548 describes a cut for a colored gemstone.
  • the gemstone is cut to comprise a crown with a table, a girdle surrounding the crown, and below the girdle a plurality of pavilion facets which point to the culit.
  • the table of the stone is a continuously stepped surface, which steps in upward direction up to the top center edge of the stone.
  • a major disadvantage of the above described generally known cutting techniques is that the majority of the stone needs to be cut away in order to achieve the desired symmetry of the stone which induces the brilliance. With a brilliant cut for example the amount of material retained seldom exceeds 50 %. Also, with the known cutting techniques, it is a pre-requisite that the interior of the stone shows perfect cristallinity and that the number of crystal defects, inclusions of foreign material, cracks or any other defects is as few as possible if an optimum stone quality is aimed at. The reason is that in order to have a brilliance which is as high as possible, the known cutting techniques are developed to render the stone transparent to light. As a consequence of this transparency any defaults present in the interior of the stone are revealed and become visible through the stone. This is unwanted.
  • the present invention aims at providing a gemstone with which the loss of material in the course of polishing may be minimised, the attractiveness of the stone being virtually independent on the presence or absence of imperfections in the stone.
  • the gemstone of the present invention is characterised by the presence of a plurality of facets.
  • the dimensions of the facets are chosen such that the stone comprises a number of adjacent facets which amounts to between 4 and 25 facets per mm 2 of surface area. In practise this means that each facet covers a surface area of between 0.25 and 0.04 mm 2 , which is extremely small.
  • the facets applied to the surface of the gemstone have such a small surface area, the facets follow the contours of the stone and loss of material in the course of polishing may be reduced to a minimum.
  • the inventor has now found that with a stone showing a large number of such adjacent small facets, not only the natural colour of the stone is revealed and gets emphasized, but also that the stone shows a high degree of brilliance the surface and that visibility of impurities, inclusions or cracks or any other defects present in the interior of the stone, may be largely reduced.
  • the surface of the stone of this invention resembles the surface of a honeycomb structure.
  • Light impinging the surface of two adjacent facets is reflected in different directions.
  • the light is reflected by a large number of facets, and as adjacent facets extend under an angle with respect to each other, the light is reflected in a vast number of widely varying directions.
  • the light has been found to reflect not only from the planes of the facets but also at the edges, as a consequence of which the gemstone shows a sparkling effect in the light.
  • the inventor has also found that by applying this faceting, the original colour of the stone is revealed and emphasized in an aesthetically attractive manner. This effect is achieved independently of the purity of the stone or the presence of inclusions of foreign material, cracks, etc.
  • a preferred embodiment of this invention is characterised in that the surface of the stone comprises 4-15, more preferably 10-12 facets per mm 2 of surface area. The inventor has found that within this range an optimum reflection of light by the faceted surface may be achieved.
  • the gemstone of this invention is characterised by adjacent facets which extend with respect to each other under an angle, the angle between adjacent facets being between 0.1-5°, preferably between 0.25-1°.
  • the facets follow the contours of the stone.
  • the weight of the stone is one of the parameters determining its value.
  • the inventor has found that with such positioning of the facets, a faceted rock may be obtained the surface of which produces an optimum reflection of the light impinging it in a large number of widely varying directions, thus inducing brilliance to the stone.
  • the angle between adjacent facets amounts to above 10°, a cut stone is obtained, the facets of which do no longer follow the original contours of the stone, the loss of material becoming undesirably high.
  • the invention is further elucidated in the appending figure and description of the figure.
  • Figure 1 is a view to the surface of a preferred embodiment of the gemstone of this invention.
  • the gemstone 1 of this invention comprises a surface area 2, showing a multiplicity of adjacent facets 3, 4, 5.
  • either the whole surface area 2 may be faceted or only part of it.
  • the latter may for example be of interest, in case only part of the stone will be visible during use. In such case it may be of economical interest to facet only the part of the surface of the stone which will be visible, or a somewhat larger part.
  • the inventor has found that even in case only part of the surface of the stone is faceted, on the faceted part the natural colour of the stone is revealed and emphasised. The partly faceting having virtually no adverse effect to the colour of the stone.
  • the facets 3-5 may have any shape ought suitable by the person skilled in the art of reflecting light impinging the surface of the stone.
  • the facets may have a geometrical shape which may be regular or irregular. Often, an irregular shape will be preferred as this has the result that a wider diversification may be obtained, of the direction in which the light incidenting the surface of the stone, is reflected.
  • the surface 2 of the stone may exclusively comprise facets having a regular shape, or an irregular shape, or a combination of both.
  • the surface of the stone may comprise facets having a substantially regular 6-edge shaped figure, facets 3,4 having a substantially irregular 5- and 3-edge shaped figure and square facets 5.
  • the surface of the stone may be composed of facets having the same or varying dimensions.
  • the dimensions of the facets will be adjusted such that 4-25, preferably 4-15, more preferably 10-12 facets per mm 2 of surface area are present.
  • this means that such facets will have a surface area of between 0.25 - 0.04, preferably 0.25 - 0.083 mm 2 , more preferably 0.10 - 0.083 mm 2 , as in this range an optimum brilliance of the stone may be achieved combined with an optimum emphasis of the natural colour of the stone and an optimum down toning of any defects, impurities and inclusions present in the stone, combined with a minimum loss of material and minimum risk to breaking of the stone upon polishing.
  • the inventor has observed that light impinging the surface of such a gemstone is immediately reflected, light absorption being largely reduced as compared to stones comprising facets having a larger surface area. With increasing surface area the risk to absorption, and the appearance of large white-like surfaces has been found to occur, which reduce the brilliance of the stone.
  • the inventor has further found that that when the surface area of a facet increases to above 0.25 mm 2 , too much light is reflected in one single direction, as a consequence of which that facet resembles a large white surface, which goes at the expense of the brilliance of the stone. Also, when the faceting of this invention is applied to ornamental diamonds for example, with increasing size of the facets there is an increasing risk to penetration of the light into the interior of the stone, which goes at the expense of the amount of light reflected by the surface of the stone. A surface area of 0.04 mm 2 per facet appeared to be the smallest possible surface area achievable with existing cutting techniques.
  • the gemstone suitable for use with the present invention may be any gemstone known to the person skilled in the art, and may for example comprise precious stones for example rough, unpolished diamond, polished diamond, industrial or ornamental diamond, diamond the surface of which shows cracks or holes, polished diamond.
  • precious stones for example rough, unpolished diamond, polished diamond, industrial or ornamental diamond, diamond the surface of which shows cracks or holes, polished diamond.
  • the faceting of the present invention may as well be applied to ornamental diamonds showing a specific cut, for example a baguette, taper, emunterde, heart, pear, round, square, marquise, oval, princess, rose, briolette, marigold, or any other cut known to the person skilled in the art.
  • the result is that the brilliance of a thus cut precious stone is further emphasised and that a sparkling effect is induced when light is impinging the stone.
  • the gemstone suitable for use with this invention may also be a semi-precious stone, for example rubin, smaragd, sapphire, granate etc.
  • a first facet is be polished.
  • a second facet adjacent the first facet is polished. This will mostly involve that an edge of the first facet gets removed, thus making the shape of the first facet asymmetric.

Landscapes

  • Adornments (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (9)

  1. Pierre gemme ayant une surface dont au moins une partie est polie, dans laquelle au moins une partie visible de la pierre est polie, caractérisée en ce que la surface polie comprend une pluralité de facettes adjacentes ayant chacune une superficie comprise entre 0,04 et 0,25 mm2, l'angle entre les facettes adjacentes est compris entre 0,1 et 5° et les facettes sont appliquées le long de la surface de la pierre de telle manière qu'elles suivent les contours originaux de la pierre.
  2. Pierre gemme telle que revendiquée dans la revendication 1, caractérisée en ce que l'aire de surface polie comprend de 4 à 25 facettes par mm2 de superficie.
  3. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 2, caractérisée en ce que l'aire de surface polie comprend de 4 à 15, de préférence de 10 à 12 facettes par mm2 de superficie.
  4. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 3, caractérisée en ce que l'angle entre les facettes adjacentes est compris entre 0,25 et 1°.
  5. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 4, caractérisée en ce que les facettes ont une forme géométrique régulière.
  6. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 4, caractérisée en ce que les facettes ont une forme géométrique qui est irrégulière.
  7. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 6, caractérisée en ce que les facettes ont virtuellement les mêmes formes.
  8. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 6, caractérisée en ce que les facettes ont une forme différente.
  9. Pierre gemme telle que revendiquée dans l'une quelconque des revendications 1 - 8, caractérisée en ce que la pierre gemme est choisie dans le groupe des pierres précieuses ou semi-précieuses.
EP03782009A 2003-12-02 2003-12-02 Pierre precieuse a facettes Expired - Lifetime EP1694155B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BE2003/000208 WO2005053454A1 (fr) 2003-12-02 2003-12-02 Pierre precieuse a facettes

Publications (2)

Publication Number Publication Date
EP1694155A1 EP1694155A1 (fr) 2006-08-30
EP1694155B1 true EP1694155B1 (fr) 2009-02-11

Family

ID=34637726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03782009A Expired - Lifetime EP1694155B1 (fr) 2003-12-02 2003-12-02 Pierre precieuse a facettes

Country Status (6)

Country Link
US (1) US20070089458A1 (fr)
EP (1) EP1694155B1 (fr)
AT (1) ATE422309T1 (fr)
AU (1) AU2003289762A1 (fr)
DE (1) DE60326180D1 (fr)
WO (1) WO2005053454A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013005031A1 (de) * 2013-03-25 2014-09-25 Leico Leiser AG Verfahren zum Versehen von Schmuckedelsteinen mit einer Kennung und mit einer solchen Kennung versehener Schmuckedelstein
FR3063604A1 (fr) * 2017-03-10 2018-09-14 Rong Yong Technique de marquage des diamants par poncage de la culasse de la pierre

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19605876C1 (de) * 1996-02-19 1997-05-28 Atelier Bunz Gmbh Geschliffener Edelstein
US6006548A (en) * 1996-09-12 1999-12-28 M. Fabrikant & Sons, Ltd. Facet cut structure for gemstones to enhance brilliance

Also Published As

Publication number Publication date
AU2003289762A1 (en) 2005-06-24
EP1694155A1 (fr) 2006-08-30
US20070089458A1 (en) 2007-04-26
DE60326180D1 (de) 2009-03-26
WO2005053454A1 (fr) 2005-06-16
ATE422309T1 (de) 2009-02-15

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