US3796065A - Stone with emerald cut crown and modified brilliant cut base - Google Patents

Stone with emerald cut crown and modified brilliant cut base Download PDF

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Publication number
US3796065A
US3796065A US00198615A US3796065DA US3796065A US 3796065 A US3796065 A US 3796065A US 00198615 A US00198615 A US 00198615A US 3796065D A US3796065D A US 3796065DA US 3796065 A US3796065 A US 3796065A
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US
United States
Prior art keywords
cut
base
halves
girdle
diamond
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Expired - Lifetime
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US00198615A
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English (en)
Inventor
B Watermeyer
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.)
JOOSTES DIAMOND CUTTING WORKS
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JOOSTES DIAMOND CUTTING WORKS
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    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C17/00—Gems or the like
    • A44C17/001—Faceting gems

Definitions

  • ABSTRACT A diamond is cut to emerald shape with the conventional crown breaks and girdle.
  • the base of the diamond is formed to pyramidal shape, the pyramid forming about 41 with the girdle plane. Adjacent the girdle base breaks are made at between 52 and 65 to the girdle plane. Between these breaks and the collet pairs of halves are formed with the result that the base breaks acquire a half-moon shape or become lunulae. At the short sides of the emerald cut shape point corners are cut to extend to the apices of the halves.
  • crux of the matter resides in the base breaks that become lunulae.
  • the square-cut has over the brilliant-cut is that the former results in a smaller loss of diamond. With a brilliant-cut the retention of diamond seldom exceeds 50 percent while with a square-cut the retention can be as high as 70 percent. Thus starting from the same raw stone the square-cut offers the diamond cutterless loss of raw material than the brilliant-cut. This has obvious economic advan-- tages.
  • One way in which a diamond is cut square is to form the crown as with an emerald-cut and forming the base with a square emerald-cut. In the latter case there are 25 to 58 full cut facets. However, there is still such a loss of fire, as compared with the brilliant-cut, that. this method is restricted to stones of a quarter carat or less.
  • An object of-the invention is to provide a cut for diamonds which is adapted to give much more fire than coventional cuts when applied to a square cutdiamond.
  • the cut of the invention is applicable to a diamond which viewed normal to the table is triangular, square rectangular or multisided in outline while the crown is cut emerald-cut fashion.
  • the present invention provides a cut diamond having a girle with at least three long sides and an equal number of short sides at the intersections of the long sides so cut as to provide a table, crown breaks of the emerald-cut type and a base which is substantially pyramidal in shape and formed with a collet characterized in that the base has: i
  • the pavilion is a residual pyramidal facet of the original pyramidal base.
  • the breaks on which the lunulae are formed preferably extend to about a quarter of the depth of the base.
  • the pyramid may for an angle of about 41 with the girdle and the halves may be formed at the same inclination so that the point corners and the halves along a ridge have a common apex point spaced from the collet.
  • the pavilions are thus of distorted lozenge shape having long points extending between halves and short truncated points extending from the collet.
  • the lunulae should be formed at angles between 52 and 65 to the plane of the girdle.
  • the invention also provides a cut diamond in which the lunulae are formed on breaks which extend about a quarter of the depth of the base.
  • FIG. 1 is a pictorial view of a stone cut according to the invention
  • FIG. 2 is an end view showing an early stage in the cutting of a diamond
  • FIG. 3 shows a later stage
  • FIG. 4 still alater stage
  • FIG. 5 is a plan view of a stone showing the reflection of the base as seen through the table.
  • a diamond out according to the invention has the following conventional features a table 6,- crown breaks 7,8 and 9, a collet 10 (shown exaggerated) at the tip of a substantially pyramid shaped base, and a girdle having long facets 11 and short or corner facets 12.
  • the breaks of course, also exist on the corners, but these have not been separately numbered.
  • the stone After being cut and polished according'to the invention the stone has four lunulae 13, eight outer halves 14 and eight inner halves 15, four point corners 16 and four pavilions l7.
  • the crown Assuming that the crown has been cut and the girdle formed in the early stages of forming the base break 20 (FIG. 2) is formed at an angle of about 65 to the plane of the girdle while the remainder of the base is formed to pyramidal shape at an angle of about 41 /2 to the same plane.
  • Working from a ridge of the pyramid each face of the pyramid is formed to provide two halves 21. Each half 21 is then further subdivided to provide outer and inner halves l4 and 15, the
  • a cut diamond having a girdle with at least three I long straight sides and an equal number of short sides at the intersections of the long sides so cut as to provide a table, crown breaks of the emerald-cut type and a base vwhich is substantially pyramidal in shape and formed with a collet, characterized in that the base has: a lunula bordering each said long side along substantially the entire length thereof and corresponding to the first base break of an emerald cut, a point corner extending from each short side along the ridges of the base pyramid, two halves to each side of each point corner, and a pavilion penetrating between each pair of halves and having an apex at the boundary of a lunula,
  • a cut diamond claimed in claim 3 in which the residual pyramidical faces form an angle of about 41 with the girdle and the halves are formed at the same inclination, so that the pavilions and the halves along a ridge have a common apex point spaced from the collet.

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  • Adornments (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US00198615A 1970-12-01 1971-11-15 Stone with emerald cut crown and modified brilliant cut base Expired - Lifetime US3796065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA708135A ZA708135B (en) 1970-12-01 1970-12-01 A new diamond cut

Publications (1)

Publication Number Publication Date
US3796065A true US3796065A (en) 1974-03-12

Family

ID=25562774

Family Applications (1)

Application Number Title Priority Date Filing Date
US00198615A Expired - Lifetime US3796065A (en) 1970-12-01 1971-11-15 Stone with emerald cut crown and modified brilliant cut base

Country Status (8)

Country Link
US (1) US3796065A (de)
JP (1) JPS5013708B1 (de)
BE (1) BE775964A (de)
DE (1) DE2158857B2 (de)
GB (1) GB1314640A (de)
IL (1) IL38158A (de)
NL (1) NL148255B (de)
ZA (1) ZA708135B (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020649A (en) * 1976-05-27 1977-05-03 Henry Grossbard Brilliantized step cut diamond
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
US5186024A (en) * 1992-02-03 1993-02-16 Dorothy P. Waters High brilliance step-cut stone and method of making same
US5454235A (en) * 1992-04-02 1995-10-03 Freiesleben; Ulrich Cut diamond
US5612102A (en) * 1993-10-13 1997-03-18 Yamato Kako Kabushiki Kaisha Faceted jewelry ornament with facet grooved for light diffraction
US5761929A (en) * 1996-09-12 1998-06-09 M. Fabrikant & Sons, Ltd. Facet cut structure for colored stones to enhance brilliance
US5970744A (en) * 1998-12-01 1999-10-26 Tiffany And Company Cut cornered square mixed-cut gemstone
USD423396S (en) * 1999-04-26 2000-04-25 Wolf Steven J Gemstone
US6158243A (en) * 1997-06-11 2000-12-12 Couture; Guy Butterfly gem
WO2002027075A2 (en) * 2000-09-26 2002-04-04 Michael Schachter Novel method for cutting natural and/or man-made diamonds and article resulting therefrom
US20050115275A1 (en) * 2001-10-19 2005-06-02 Michael Kedem Rounded rectangular gemstone
US7146827B2 (en) 2001-05-18 2006-12-12 Diamond Innovations, Llc Mixed cut gemstone
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond
USD836020S1 (en) * 2016-07-06 2018-12-18 Bonoli S.R.L. Gemstone
US10362843B2 (en) 2007-12-14 2019-07-30 II Leonard J. Strnad Gemstone and method for cutting the same
US10448713B1 (en) 2017-07-28 2019-10-22 Brian Steven Gavin Emerald-cut diamond
USD874326S1 (en) * 2016-10-10 2020-02-04 Bonoli S.R.L. Gemstone
EP3804553A1 (de) * 2019-10-10 2021-04-14 D. Swarovski KG Schliff für einen edelstein

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51131552U (de) * 1975-04-14 1976-10-23

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2009390A (en) * 1934-03-06 1935-07-30 Bayardi Brothers Inc Cut diamond
US3286486A (en) * 1964-01-10 1966-11-22 Huisman James Diamond with specially faceted pavilion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2009390A (en) * 1934-03-06 1935-07-30 Bayardi Brothers Inc Cut diamond
US3286486A (en) * 1964-01-10 1966-11-22 Huisman James Diamond with specially faceted pavilion

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Dieulafait, Diamonds & Precious Stones, Pub. by Scribner, Armstrong & Co., 1876, p. 93 relied on. *
Webster et al., Introductory Gemology, Pub. by Gemological Institute of America (1945), Los Angeles, pp. 130 131 relied on. *

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720267A1 (de) * 1976-05-27 1977-12-08 Henry Grossbard Brillantartiger facettenschliff an einem schmuckstein
FR2352648A1 (fr) * 1976-05-27 1977-12-23 Grossbard Henry Diamant taille a degres
US4020649A (en) * 1976-05-27 1977-05-03 Henry Grossbard Brilliantized step cut diamond
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
US5186024A (en) * 1992-02-03 1993-02-16 Dorothy P. Waters High brilliance step-cut stone and method of making same
US5657647A (en) * 1992-04-02 1997-08-19 Freiesleben; Ulrich Cut diamond
US5454235A (en) * 1992-04-02 1995-10-03 Freiesleben; Ulrich Cut diamond
US5612102A (en) * 1993-10-13 1997-03-18 Yamato Kako Kabushiki Kaisha Faceted jewelry ornament with facet grooved for light diffraction
US5761929A (en) * 1996-09-12 1998-06-09 M. Fabrikant & Sons, Ltd. Facet cut structure for colored stones to enhance brilliance
US6158243A (en) * 1997-06-11 2000-12-12 Couture; Guy Butterfly gem
US5970744A (en) * 1998-12-01 1999-10-26 Tiffany And Company Cut cornered square mixed-cut gemstone
EP1013190A1 (de) * 1998-12-01 2000-06-28 Tiffany and Company Gemischt geschliffener Edelstein mit Quadrat-Eckenschliff
USD423396S (en) * 1999-04-26 2000-04-25 Wolf Steven J Gemstone
US6892720B2 (en) 2000-09-26 2005-05-17 Michael Schachter Method for cutting natural and/or man-made diamonds
WO2002027075A3 (en) * 2000-09-26 2002-06-13 Michael Schachter Novel method for cutting natural and/or man-made diamonds and article resulting therefrom
US6615611B1 (en) * 2000-09-26 2003-09-09 Michael Schachter High yield diamond
US20030181147A1 (en) * 2000-09-26 2003-09-25 Michael Schachter Method for cutting natural and/or man-made diamonds
US20030188551A1 (en) * 2000-09-26 2003-10-09 Michael Schachter High yield diamond
WO2002027075A2 (en) * 2000-09-26 2002-04-04 Michael Schachter Novel method for cutting natural and/or man-made diamonds and article resulting therefrom
US7146827B2 (en) 2001-05-18 2006-12-12 Diamond Innovations, Llc Mixed cut gemstone
US20050115275A1 (en) * 2001-10-19 2005-06-02 Michael Kedem Rounded rectangular gemstone
US10362843B2 (en) 2007-12-14 2019-07-30 II Leonard J. Strnad Gemstone and method for cutting the same
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond
USD836483S1 (en) 2016-07-06 2018-12-25 Bonoli S.R.L. Gemstone
USD859205S1 (en) 2016-07-06 2019-09-10 Bonoli S.R.L. Gemstone
USD836481S1 (en) 2016-07-06 2018-12-25 Bonoli S.R.L. Gemstone
USD836482S1 (en) 2016-07-06 2018-12-25 Bonoli S.R.L. Gemstone
USD836480S1 (en) 2016-07-06 2018-12-25 Bonoli S.R.L. Gemstone
USD836020S1 (en) * 2016-07-06 2018-12-18 Bonoli S.R.L. Gemstone
USD836019S1 (en) 2016-07-06 2018-12-18 Bonoli S.R.L. Gemstone
USD836021S1 (en) 2016-07-06 2018-12-18 Bonoli S.R.L. Gemstone
USD879652S1 (en) 2016-07-06 2020-03-31 Bonoli S.R.L. Gemstone
USD874326S1 (en) * 2016-10-10 2020-02-04 Bonoli S.R.L. Gemstone
USD874327S1 (en) * 2016-10-10 2020-02-04 Bonoli S.R.L. Gemstone
US10448713B1 (en) 2017-07-28 2019-10-22 Brian Steven Gavin Emerald-cut diamond
US11478052B1 (en) 2017-07-28 2022-10-25 Lebipime Ip Llc Emerald-cut diamond method
EP3804553A1 (de) * 2019-10-10 2021-04-14 D. Swarovski KG Schliff für einen edelstein

Also Published As

Publication number Publication date
DE2158857A1 (de) 1972-06-08
DE2158857B2 (de) 1974-03-14
IL38158A (en) 1974-01-14
JPS5013708B1 (de) 1975-05-22
ZA708135B (en) 1972-07-26
IL38158A0 (en) 1972-01-27
BE775964A (de) 1971-12-15
NL7116496A (de) 1972-06-05
DE2158857C3 (de) 1974-10-10
NL148255B (nl) 1976-01-15
GB1314640A (en) 1973-04-26

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