EP0587851B1 - Cut diamond - Google Patents

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Publication number
EP0587851B1
EP0587851B1 EP93907771A EP93907771A EP0587851B1 EP 0587851 B1 EP0587851 B1 EP 0587851B1 EP 93907771 A EP93907771 A EP 93907771A EP 93907771 A EP93907771 A EP 93907771A EP 0587851 B1 EP0587851 B1 EP 0587851B1
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EP
European Patent Office
Prior art keywords
facets
diamond
girdle
angle
pct
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Expired - Lifetime
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EP93907771A
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German (de)
French (fr)
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EP0587851A1 (en
Inventor
Ulrich Freiesleben
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Individual
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Individual
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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

  • the invention relates to a diamond without a table, in which the facets of the upper part are more inclined to the Rondist plane than the facets of the lower part.
  • the object of the invention is therefore to grind a rough diamond in such a way that an impression of its hardness and clarity is obtained in plan view with the least possible material consumption.
  • the invention provides for the diamond mentioned at the outset that the angle between one of the equally large upper part facets and the preferably polygonal Rondist plane is 20.5 ° and the angle between one of the equally large lower part facets and the Rondist plane is 40.0 ° .
  • the effect of a multi-beam star outweighs those areas of luminous brilliance.
  • the facets of the upper part preferably meet with the facets of the lower part, offset in the middle at the Rondist level, whereby the multi-beam nature of the star impression is further increased.
  • the upper part and lower part of the former diamond expediently each have eight to sixteen facets, while in the second diamond a number of facets in the upper part and lower part of four is recommended.
  • the surface of the diamond offers a shining cross on a surface of brilliant light.
  • the upper part 2 of the diamond which consists of four facets of the same size and tapering to form a cup 3, rises above the square girdle plane 1.
  • Each facet, such as facet 4 forms an isosceles triangle.
  • the lower part 5 of the diamond also consists of four facets of the same size, which run towards the lower cup 6.
  • the angle a between the facet 4 of the upper part and the girdle plane 1 is 24.5 ° and the angle b between the facet 7 of the lower part and the girdle plane 1 is 39.5 °.
  • the appearance of the above-described diamond when viewed from the top consists of four equal-sized triangles 12, 14, 16, 18, each of which is flat and uniform, originating from one side edge of a square, which has a flat, uniform brilliance 20 are separated from each other.
  • the cross consists of four bright, equilateral, slender triangles 22, 24, 26, 28, the tips of which lie in one corner of the square and whose base encloses a small square 30 that appears in the center of the square.
  • the brightness of the diagonal cross is greater than the brilliance of the triangular areas 12 ... 18.
  • Each of the four slender triangles 22, 24, 26, 28 is penetrated by its center line 23, 25, 27, 29, the center lines continuing into the square 30 and quartering it.
  • the cross 20 is reminiscent of the appearance of a four-pointed star. What is striking about the appearance according to FIG. 2 is the complete absence of any color in the case of white light striking the diamonds.

Abstract

PCT No. PCT/DE93/00304 Sec. 371 Date May 4, 1994 Sec. 102(e) Date May 4, 1994 PCT Filed Apr. 2, 1993 PCT Pub. No. WO93/19635 PCT Pub. Date Oct. 14, 1993.A diamond without plate is described, in which the facets of the upper part are more slanted toward the girdle level than the facets of the lower part. To create a diamond that, with the least possible quantity of material, gives one an impression of hardness and clarity when looking down on it, the angle between one of the equally large upper part facets and the preferably polygonal girdle level as well as the angle between one of the equally large lower part facets and the girdle level is chosen in such a way that seen from above, the girdle level appears in essentially homogenous, planar brilliance in which a central, shining star is imbedded.

Description

Die Erfindung betrifft einen Diamanten ohne Tafel, bei welchem die Facetten des Oberteils zur Rondistenebene stärker geneigt sind als die Facetten des Unterteils.The invention relates to a diamond without a table, in which the facets of the upper part are more inclined to the Rondist plane than the facets of the lower part.

Aus der deutschen Auslegeschrift 1 557 625 sind Edelsteine der vorstehend genannten Art mit vier Facetten bekannt. Dabei wurden der Winkel a zwischen einer Facette des Oberteils und der Rondistenebene und der Winkel b zwischen einer Facette des Unterteils und der Rondistenebene stets so gewählt, daß der Diamant bei Draufsicht optimale Brillanz erkennen läßt. Unter Brillanz wird dabei in Übereinstimmung mit Rösch: Was ist ein Brillant ? in: Goldschmiedezeitung, Heft 12, 1971, S. 39 die Summe aus Oberflächenglanz und Unterteilreflexion verstanden, wobei das vom Oberteil in den Diamanten einfallende Licht an den Facetten des Unterteils totalreflektiert wird. Um einem Diamanten möglichst viel "Feuer", das heißt ein möglichst großes Farbenspiel mitzugeben, wurden 50 und mehr Facetten an das Oberteil angeschliffen, so daß sich eine große Zahl von in verschiedene Richtungen weisende, zum Teil farbige Spiegelungen ergaben, die zur Wertschätzung des Diamanten erheblich beitrugen.Gemstones of the above-mentioned type with four facets are known from German publication 1 557 625. The angle a between a facet of the upper part and the Rondist plane and the angle b between a facet of the lower part and the Rondist plane were always chosen so that the diamond reveals optimum brilliance when viewed from above. Brilliance in accordance with Rösch means: What is a brilliant? in: Goldschmiedezeitung, Issue 12, 1971, p. 39 understood the sum of surface gloss and lower part reflection, whereby the light incident from the upper part in the diamonds is totally reflected on the facets of the lower part. In order to give a diamond as much "fire" as possible, that is to say the greatest possible play of colors, 50 or more facets were ground to the upper part, so that there were a large number of reflections pointing in different directions, some of which were colored, which meant that the diamond was valued contributed significantly.

Diese Betrachtungsweise berücksichtigt nicht die Tatsache, daß der Diamant ein edler, selten vorkommender Stein ist, der vor Jahrmillionen in der Tiefe der Erde unter extremen Bedingungen zu einer Form entstand, die er seither unverändert bewahrte und noch heute sichtbar werden läßt. Einen Diamanten so zu präparieren, daß er als Schmuckstein möglichst viel Feuer verbreitet, wird, bedenkt man die Geschichte des Steins, seiner Härte, Beständigkeit und Klarheit sowie der Ästhetik des Materials nicht gerecht.This approach does not take into account the fact that diamond is a precious, rare stone that was created millions of years ago in the depths of the earth in extreme conditions to a shape that it has kept unchanged ever since can be seen today. Preparing a diamond in such a way that it will spread as much fire as a gemstone does not do justice to the history of the stone, its hardness, durability and clarity as well as the aesthetics of the material.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Rohdiamanten so anzuschleifen, daß bei möglichst geringem Materialverbrauch in Draufsicht ein Eindruck seiner Härte und Klarheit entsteht.The object of the invention is therefore to grind a rough diamond in such a way that an impression of its hardness and clarity is obtained in plan view with the least possible material consumption.

Dazu sieht die Erfindung für den eingangs genannten Diamanten vor, daß der Winkel zwischen einer der gleich großen Oberteil-Facetten und der bevorzugt polygonalen Rondistenebene 20,5° und der Winkel zwischen einer der gleich großen Unterteil-Facetten und der Rondistenebene 40,0° beträgt. Hierbei überwiegt bei der Betrachtung die Wirkung eines vielstrahligen Sterns diejenigen Bereiche lichtflächiger Brillanz.For this purpose, the invention provides for the diamond mentioned at the outset that the angle between one of the equally large upper part facets and the preferably polygonal Rondist plane is 20.5 ° and the angle between one of the equally large lower part facets and the Rondist plane is 40.0 ° . When looking at this, the effect of a multi-beam star outweighs those areas of luminous brilliance.

Eine andere Lösung der genannten Aufgabe sieht für den eingangs definierten Diamanten vor, daß der Winkel zwischen einer der gleich großen Oberteil-Facetten und der bevorzugt polygonalen Rondistenebene 24,5° und der Winkel zwischen einer der gleich großen Unterteil-Facetten und der Rondistenebene 39,5° beträgt. Der in der Mitte der Rondistenebene aufleuchtende Stern, dessen Strahlenzahl von der Eckenzahl der Rondistenebene beeinflußt ist, in Verbindung mit den übrigen Bereichen lichtflächiger Brillanz erzeugt einen Eindruck von Ruhe und Härte, die dem Stein aufgrund seines Alters und seiner Beständigkeit zukommt.Another solution to the stated problem provides for the diamond defined at the outset that the angle between one of the same-sized upper part facets and the preferably polygonal Rondist plane 24.5 ° and the angle between one of the same-sized lower part facets and the Rondist plane 39, Is 5 °. The star that lights up in the middle of the Rondist level, the number of rays of which is influenced by the number of corners on the Rondist level, in connection with the other areas of luminous brilliance creates an impression of calmness and hardness that the stone has due to its age and its durability.

Bevorzugt treffen die Facetten des Oberteils mit den Facetten des Unterteils an der Rondistenebene mittig versetzt aufeinander, wodurch die Vielstrahligkeit des Sterneindrucks noch erhöht wird.The facets of the upper part preferably meet with the facets of the lower part, offset in the middle at the Rondist level, whereby the multi-beam nature of the star impression is further increased.

Oberteil und Unterteil des erstgenannten Diamanten weisen zweckmäßig jeweils acht bis sechzehn Facetten auf, während bei dem zweitgenannten Diamanten sich eine Facettenzahl im Oberteil und Unterteil von jeweils vier empfiehlt. Im letzteren Fall bietet die Aneicht des Diamanten ein strahlendes Kreuz auf einer Fläche lichtflächiger Brillanz.The upper part and lower part of the former diamond expediently each have eight to sixteen facets, while in the second diamond a number of facets in the upper part and lower part of four is recommended. In the latter case, the surface of the diamond offers a shining cross on a surface of brilliant light.

Die Erfindung wird nachstehend anhand des in der beigefügten Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Es zeigen:

Fig. 1
eine perspektivische Ansicht eines geschliffenen Diamanten mit eingezeichneten Winkeln a und b zwischen einer Oberteil-Facette bzw. einer Unterteil-Facette und der Rondistenebene; und
Fig. 2
eine schematische Darstellung des Erscheinungsbildes des Diamanten nach Figur 1.
The invention is explained below with reference to the embodiment shown in the accompanying drawings. Show it:
Fig. 1
a perspective view of a cut diamond with drawn angles a and b between an upper part facet or a lower part facet and the Rondist plane; and
Fig. 2
is a schematic representation of the appearance of the diamond of Figure 1.

Bei dem Diamanten nach Fig. 1 und 2 erhebt sich über der quadratischen Rondistenebene 1 das Oberteil 2 des Diamanten, welches aus vier gleichgroßen, zu einer Kalette 3 zulaufenden Facetten besteht. Jede Facette, wie etwa die Facette 4, bildet ein gleichschenkliges Dreieck.In the case of the diamond according to FIGS. 1 and 2, the upper part 2 of the diamond, which consists of four facets of the same size and tapering to form a cup 3, rises above the square girdle plane 1. Each facet, such as facet 4, forms an isosceles triangle.

Das Unterteil 5 des Diamanten besteht ebenfalls aus vier gleichgroßen Facetten, die zu der unteren Kalette 6 zulaufen. Jede Facette des Unterteils 5, beispielsweise die Facette 7, bildet ein gleichschenkliges Dreieck, so daß die Kaletten 3 und 6 auf einer Mittellinie senkrecht zur Rondiste des Diamanten liegen.The lower part 5 of the diamond also consists of four facets of the same size, which run towards the lower cup 6. Each facet of the lower part 5, for example the facet 7, forms an isosceles triangle, so that the calibres 3 and 6 lie on a center line perpendicular to the diamond girdle.

Der Winkel a zwischen der Facette 4 des Oberteils und der Rondistenebene 1 beträgt 24,5° und der Winkel b zwischen der Facette 7 des Unterteils und der Rondistenebene 1 beträgt 39,5°.The angle a between the facet 4 of the upper part and the girdle plane 1 is 24.5 ° and the angle b between the facet 7 of the lower part and the girdle plane 1 is 39.5 °.

Das Erscheinungsbild des vorstehend beschriebenen Diamanten bei Draufsicht auf das Oberteil besteht gemäß Fig. 2 aus vier gleichgroßen, von je einer Seitenkante eines Quadrates ausgehenden, gleichschenkligen Dreiecken 12, 14, 16, 18 jeweils flächiger, einheitlicher Brillanz, welche von einem aufscheinenden diagonalen Kreuz 20 voneinander getrennt sind. Das Kreuz besteht aus vier hellen gleichseitigen, schlanken Dreiecken 22, 24, 26, 28, deren Spitzen in je einer Ecke des Quadrates liegen und deren Basis ein in der Mitte des Quadrats erscheinendes kleines Quadrat 30 umschließen. Die Helligkeit des diagonalen Kreuzes ist größer als die Brillanz der Dreiecksflächen 12 ... 18. Jedes der vier schlanken Dreiecke 22, 24, 26, 28 ist von seiner Mittellinie 23, 25, 27, 29 durchsetzt, wobei sich die Mittellinien in das Quadrat 30 fortsetzen und es vierteln. Das Kreuz 20 erinnert dadurch an das Aussehen eines vierstrahligen Sterns. Auffallend an dem Erscheinungsbild gemäß Fig. 2 ist das vollständige Fehlen jeglicher Farbigkeit bei auf den Diamanten auftreffendem weißen Licht.According to FIG. 2, the appearance of the above-described diamond when viewed from the top consists of four equal-sized triangles 12, 14, 16, 18, each of which is flat and uniform, originating from one side edge of a square, which has a flat, uniform brilliance 20 are separated from each other. The cross consists of four bright, equilateral, slender triangles 22, 24, 26, 28, the tips of which lie in one corner of the square and whose base encloses a small square 30 that appears in the center of the square. The brightness of the diagonal cross is greater than the brilliance of the triangular areas 12 ... 18. Each of the four slender triangles 22, 24, 26, 28 is penetrated by its center line 23, 25, 27, 29, the center lines continuing into the square 30 and quartering it. The cross 20 is reminiscent of the appearance of a four-pointed star. What is striking about the appearance according to FIG. 2 is the complete absence of any color in the case of white light striking the diamonds.

Claims (5)

  1. Tabletless diamond in which the facets of the upper part (2) are more steeply inclined towards the central plane (1) or girdle than the facets of the lower part (5), characterized in that the angle (a) between one (4) of the equally sized upper facets and the preferably polygonal girdle (1) amounts to 20,5° and the angle (b) between one (7) of the equally sized lower facets and the girdle (1) amounts to 40,4°.
  2. Tabletless diamond in which the facets of the upper part (2) are more steeply inclined towards the central plane (1) or girdle than the facets of the lower part (5), characterized in that the angle (a) between one (4) of the equally sized upper facets and the preferably polygonal girdle (1) amounts to 24,5° and the angle (b) between one (7) of the equally sized lower facets and the girdle (1) amounts to 39,5°.
  3. Diamond according to claim 1, characterized in that the upper facets meet with the lower facets, centrally shifted, on the girdle.
  4. Diamond according to one of the claims 1 or 2, characterized in that the upper part (2) and the lower part (5) show respectively four facets.
  5. Diamond according to claim 1 or 3, characterized in that the upper part (2) and the lower part (5) show respectively eight to sixteen facets.
EP93907771A 1992-04-02 1993-04-01 Cut diamond Expired - Lifetime EP0587851B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4210995 1992-04-02
DE4210995A DE4210995C2 (en) 1992-04-02 1992-04-02 Cut gem, especially diamond
PCT/DE1993/000304 WO1993019635A1 (en) 1992-04-02 1993-04-01 Cut diamond

Publications (2)

Publication Number Publication Date
EP0587851A1 EP0587851A1 (en) 1994-03-23
EP0587851B1 true EP0587851B1 (en) 1997-07-30

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ID=6455837

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EP93907771A Expired - Lifetime EP0587851B1 (en) 1992-04-02 1993-04-01 Cut diamond

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US (2) US5454235A (en)
EP (1) EP0587851B1 (en)
JP (1) JP2758266B2 (en)
AT (1) ATE155968T1 (en)
DE (3) DE4210995C2 (en)
DK (1) DK0587851T3 (en)
ES (1) ES2107014T3 (en)
GR (1) GR3025096T3 (en)
HK (1) HK1001711A1 (en)
WO (1) WO1993019635A1 (en)

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE19605876C1 (en) * 1996-02-19 1997-05-28 Atelier Bunz Gmbh Jewel, e.g. diamond
DE19734036A1 (en) * 1997-08-06 1999-02-11 Helmut Buerger Process for determining a gemstone cut with high reflection, process for grinding a gemstone with high reflection and cut gemstone with high reflection
USD434691S (en) * 1999-12-10 2000-12-05 D. Swarovski & Co. Ornamental article of glass, natural gemstone or artificial gemstone
US6305193B1 (en) 2000-10-17 2001-10-23 Continental Jewelry (Usa) Inc. Gemstone
JP3863374B2 (en) * 2001-01-22 2006-12-27 尚丈 首藤 Diamond cutting methods and proportions
US6401489B1 (en) 2001-02-12 2002-06-11 Continental Jewelry (Usa), Inc. Gemstone
US6698239B2 (en) 2001-02-23 2004-03-02 Samuel Aaron, Inc. Brilliant cut diamond
US7146827B2 (en) * 2001-05-18 2006-12-12 Diamond Innovations, Llc Mixed cut gemstone
US6745596B2 (en) 2001-05-31 2004-06-08 Samuel Aaron, Inc. Princess cut diamond
US20050000246A1 (en) * 2003-07-03 2005-01-06 Brookshire Michael David Method of faceting of gemstones to produce spiraling effect
US20050000405A1 (en) * 2003-07-03 2005-01-06 Brookshire Michael D. Celebration diamond having dome-shaped crown with pavilion
US20050011226A1 (en) * 2003-07-14 2005-01-20 David So Precious stone cut and method of making
JP2009142455A (en) * 2007-12-14 2009-07-02 Juho:Kk Diamond, diamond-shaped jewelry, and its cutting method
DE202009003629U1 (en) 2008-09-12 2009-05-28 Bürger, Helmut Faceted cut gemstone, especially diamond
DE102008046972B4 (en) 2008-09-12 2016-03-24 Helmut Bürger Faceted cut gemstone, especially diamond
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554901A (en) * 1945-06-01 1951-05-29 Fromholt Felix Diamond indenter for testing the hardness of metals
US2587972A (en) * 1946-01-30 1952-03-04 George W Crise Gem stone for articles of jewelry
DE1557625C3 (en) * 1967-01-21 1973-10-25 Bernd 6581 Stipshausen Munsteiner Cut gemstone
ZA708135B (en) * 1970-12-01 1972-07-26 Joostes Diamond Cutting Works A new diamond cut
DE2254321A1 (en) * 1972-11-06 1974-05-16 Neeser Billian Lucia Margarida CUT GEMSTONE
US3835665A (en) * 1973-04-13 1974-09-17 G Kitchel Faceted gem with embedded means for producing variable pattern
IE42227B1 (en) * 1975-01-02 1980-07-02 Toye Gemstones Ltd Impovements in or relating to methods of polishing diamonds
IL58834A (en) * 1978-12-06 1982-12-31 Clarke Roger Maxwell Gemstone and method and device for cutting it
DE3202302C2 (en) * 1982-01-26 1984-01-26 Atelier-Juwel Georg Bunz, 7544 Dobel Cut gemstone, especially diamond
US4604876A (en) * 1984-08-06 1986-08-12 Reinhold Hoffmann Imitation gem
US4708001A (en) * 1985-09-04 1987-11-24 Alburger James R Faceted gem cut from shallow gemstone material
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

Also Published As

Publication number Publication date
JP2758266B2 (en) 1998-05-28
DE4210995A1 (en) 1993-10-07
US5657647A (en) 1997-08-19
DE4210995C2 (en) 1997-04-03
ATE155968T1 (en) 1997-08-15
DE9320280U1 (en) 1994-06-01
HK1001711A1 (en) 1998-07-03
US5454235A (en) 1995-10-03
GR3025096T3 (en) 1998-01-30
DE59306999D1 (en) 1997-09-04
EP0587851A1 (en) 1994-03-23
WO1993019635A1 (en) 1993-10-14
ES2107014T3 (en) 1997-11-16
JPH06507821A (en) 1994-09-08
DK0587851T3 (en) 1997-12-29

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