EP0587851A1 - Cut diamond. - Google Patents

Cut diamond.

Info

Publication number
EP0587851A1
EP0587851A1 EP93907771A EP93907771A EP0587851A1 EP 0587851 A1 EP0587851 A1 EP 0587851A1 EP 93907771 A EP93907771 A EP 93907771A EP 93907771 A EP93907771 A EP 93907771A EP 0587851 A1 EP0587851 A1 EP 0587851A1
Authority
EP
European Patent Office
Prior art keywords
facets
angle
diamond
rondist
plane
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.)
Granted
Application number
EP93907771A
Other languages
German (de)
French (fr)
Other versions
EP0587851B1 (en
Inventor
Ulrich Freiesleben
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Family has litigation
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Application filed by Individual filed Critical Individual
Publication of EP0587851A1 publication Critical patent/EP0587851A1/en
Application granted granted Critical
Publication of EP0587851B1 publication Critical patent/EP0587851B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 invention relates to a diamond without a table, in which the facets of the upper part are inclined more towards the Rondist plane than the facets of the lower part.
  • the invention is therefore based on the object of grinding a rough diamond in such a way that, with the least possible material consumption, an impression of its hardness and clarity is obtained in a top view.
  • the invention provides for the diamond mentioned at the outset to select the angle between one of the same-sized upper part facets and the preferably polygonal Rondist plane and the angle between one of the same-sized lower part facets and the Rondist plane so that the Rondist plane in plan view in appears essentially homogeneous and luminous brilliance, in which a central, shining star is embedded.
  • the areas of luminous brilliance create the impression of calm and hardness that the stone has due to its age and durability.
  • 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, arises as a purely optical phenomenon, that is to say without additional grinding surfaces.
  • a preferred embodiment of the invention provides that about eight to sixteen facets of the same size emanate from the two diamonds of the diamond in the upper part and in the lower part, each upper part facet making an angle of approximately 20.5 ° with the girdle plane and each base facet forms an angle of approximately 40.0 ° with the Rondist plane.
  • the effect of the multi-beam star outweighs that of the areas of luminous brilliance.
  • the multi-beam effect of the star impression can be increased if the facets of the upper part do not coincide with the facets of the lower part at the Rondist level, but meet at this center, offset with one another.
  • the calmness and hardness of the stone is particularly emphasized when the Rondist plane is square and the angle between each of the four upper part facets and the Rondist plane is approximately 24.5 ° and the angle between each of the lower part facets and the Rondist level is chosen to be approximately 39.5 °.
  • a lying, shining cross appears on a surface of brilliant light.
  • FIG. 1 shows a perspective view of a cut diamond with angles a and b drawn in between an upper part facet or a lower part facet and the girdle plane;
  • FIG. 2 is a top view of the diamond of FIG. 1.
  • 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 above consists of four equal-sized triangles 12, 14, 16, 18, each of which is flat and uniform, starting from one side edge of a square, and which has a flat, uniform brilliance, which is apparent from a diagonal Cross 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 the base of which surrounds 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 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

BESCHREIBUNGDESCRIPTION
Geschliffener DiamantCut diamond
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 inclined more towards the Rondist plane than the facets of the lower part.
Aus der deutschen Auslegeschrift 1 557 625 sind Edelsteine der vorstehend genannten Art 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 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 top, 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 view does not take into account the fact that the diamond is a noble, rare stone that was created millions of years ago in the depths of the earth in extreme conditions to a form 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 possible 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 invention is therefore based on the object of grinding a rough diamond in such a way that, with the least possible material consumption, an impression of its hardness and clarity is obtained in a top view.
Dazu sieht die Erfindung für den eingangs genannten Diamanten vor, den Winkel zwischen einer der gleich großen Oberteil-Facetten und der bevorzugt polygonalen Rondistenebene sowie den Winkel zwischen einer der gleich großen Unterteil-Facetten und der Rondistenebene so zu wählen, daß die Rondistenebene in Draufsicht in im wesentlichen homogener und lichtflächiger Brillanz erscheint, in welche ein zentraler, leuchtender Stern eingebettet ist. Durch die Bereiche lichtflächiger Brillanz entsteht der Eindruck von Ruhe und Härte, die dem Stein aufgrund seines Alters und seiner Beständigkeit zukommt. Der in der Mitte der Rondistenebene aufleuchtende Stern, dessen Strahlenzahl von der Eckenzahl der Rondistenebene beeinflußt ist, entsteht als rein optisches Phänomen, das heißt ohne zusätzliche Schlifflachen.For this purpose, the invention provides for the diamond mentioned at the outset to select the angle between one of the same-sized upper part facets and the preferably polygonal Rondist plane and the angle between one of the same-sized lower part facets and the Rondist plane so that the Rondist plane in plan view in appears essentially homogeneous and luminous brilliance, in which a central, shining star is embedded. The areas of luminous brilliance create the impression of calm and hardness that the stone has due to its age and durability. 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, arises as a purely optical phenomenon, that is to say without additional grinding surfaces.
Eine bevorzugte Ausführungsform der Erfindung sieht vor, daß von den beiden Kaletten des Diamanten im Oberteil wie im Unterteil etwa acht bis sechzehn gleich große Facetten ausgehen, wobei jede Oberteil-Facette mit der Rondistenebene einen Winkel von etwa 20,5° und jede Unterteil-Facette mit der Rondistenebene einen Winkel von etwa 40,0° einschließt. Hierbei überwiegt bei der Betrachtung die Wirkung des vielstrahligen Sterns diejenige der Bereiche lichtflächiger Brillanz. Die Vielstrahligkeit des Stern-Eindrucks kann erhöht werden, wenn die Facetten des Oberteils nicht kantengleich mit den Facetten des Unterteils an der Rondistenebene zusammenlaufen, sondern an dieser mittig versetzt aufeinandertreffen.A preferred embodiment of the invention provides that about eight to sixteen facets of the same size emanate from the two diamonds of the diamond in the upper part and in the lower part, each upper part facet making an angle of approximately 20.5 ° with the girdle plane and each base facet forms an angle of approximately 40.0 ° with the Rondist plane. When viewed, the effect of the multi-beam star outweighs that of the areas of luminous brilliance. The multi-beam effect of the star impression can be increased if the facets of the upper part do not coincide with the facets of the lower part at the Rondist level, but meet at this center, offset with one another.
Nach einer anderen Ausführungsform der Erfindung wird die Ruhe und Härte des Steins besonders betont, wenn die Rondistenebene quadratisch ist und der Winkel zwischen jeder der vier Oberteil-Facetten und der Rondistenebene zu etwa 24,5° und der Winkel zwischen jeder der Unterteil-Facetten und der Rondistenebene zu etwa 39,5° gewählt wird. In Ansicht dieses Steins erscheint ein liegendes, strahlendes Kreuz auf einer Fläche lichtflächiger Brillanz.According to another embodiment of the invention, the calmness and hardness of the stone is particularly emphasized when the Rondist plane is square and the angle between each of the four upper part facets and the Rondist plane is approximately 24.5 ° and the angle between each of the lower part facets and the Rondist level is chosen to be approximately 39.5 °. In the view of this stone, a lying, shining cross appears on a surface of brilliant light.
Die Erfindung wird nachstehend anhand des in der beigefügten Zeichnung dargestellten Ausführungs¬ beispiels im einzelnen erläutert. Es zeigen:The invention is explained in detail below on the basis of the exemplary embodiment shown in the accompanying drawing. Show it:
Fig. 1 eine perspektivische Ansicht eines geschlif¬ fenen Diamanten mit eingezeichneten Winkeln a und b zwischen einer Oberteil-Facette bzw. einer Unterteil-Facette und der Rondistenebene; und1 shows a perspective view of a cut diamond with angles a and b drawn in between an upper part facet or a lower part facet and the girdle plane; and
Fig. 2 eine Draufsicht auf den Diamanten nach Fig. 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.FIG. 2 is a top view of the diamond of FIG. 1. In 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, beispiels¬ weise die Facette 7, bildet ein gleichschenkliges Dreieck, so daß die Kaletten 3 und 6 auf einer Mittel¬ linie 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, einheit¬ licher 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 above consists of four equal-sized triangles 12, 14, 16, 18, each of which is flat and uniform, starting from one side edge of a square, and which has a flat, uniform brilliance, which is apparent from a diagonal Cross 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 the base of which surrounds 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 white light striking the diamonds.

Claims

ANSPRÜCHE EXPECTATIONS
1. Diamant ohne Tafel, bei welchem die Facetten des Oberteils (2) zur Rondistenebene (l) stärker geneigt sind als die Facetten des Unterteils (5) , dadurch gekennzeichnet, daß der Winkel (a) zwischen einer (4) der gleich großen Oberteil-Facetten und der bevorzugt polygonalen Rondistenebene (1) sowie der Winkel (b) zwischen einer (7) der gleich großen Unterteil-Facetten und der Rondistenebene (1) so gewählt ist, daß die Rondistenebene in Draufsicht in im wesentlichen homogener und lichtflächiger Brillanz erscheint, in welche ein zentraler, leuchtender Stern eingebettet ist.1. Diamond without table, in which the facets of the upper part (2) to the Rondist plane (l) are more inclined than the facets of the lower part (5), characterized in that the angle (a) between one (4) of the same size upper part Facets and the preferred polygonal Rondist plane (1) and the angle (b) between one (7) of the same-sized lower part facets and the Rondist plane (1) is selected so that the Rondist plane appears in plan view in a substantially homogeneous and light-filled brilliance , in which a central, shining star is embedded.
2. Diamant nach Anspruch 1, dadurch gekennzeichnet, daß von den beiden Kaletten (3, 6) des Diamanten im Oberteil (2) wie im Unterteil (5) etwa acht bis sechzehn gleich große Facetten ausgehen, wobei jede Oberteil-Facette mit der Rondistenebene einen Winkel von etwa 20,5° und jede Unterteil-Facette mit der Rondistenebene eine Winkel von etwa 40,0° einschließt.2. Diamond according to claim 1, characterized in that from the two calibres (3, 6) of the diamond in the upper part (2) as in the lower part (5) emanate approximately eight to sixteen facets of equal size, each upper part facet with the girdle level an angle of approximately 20.5 ° and each lower part facet with the Rondist plane encloses an angle of approximately 40.0 °.
3. Diamant nach Anspruch 2, dadurch gekennzeichnet, daß die Facetten des Oberteils mit den Facetten des Unterteils an der Rondistenebene mittig versetzt aufeinandertre fen.3. Diamond according to claim 2, characterized in that the facets of the upper part with the facets of the lower part on the Rondistenebene staggered aufeinandertre fen.
4. Diamant nach Anspruch 1, dadurch gekennzeichnet, daß die Rondistenebene (1) quadratisch ist und der Winkel (a) zwischen jeder der vier Oberteil- Facetten und der Rondistenebene etwa 24,5° und der -1-4. Diamond according to claim 1, characterized in that the Rondistebene (1) is square and the angle (a) between each of the four top facets and the Rondistenebene about 24.5 ° and -1-
Winkel zwischen jeder der Unterteil-Facetten und der Rondistenebene etwa 39,5° beträgt. Angle between each of the lower part facets and the Rondist plane is approximately 39.5 °.
EP93907771A 1992-04-02 1993-04-01 Cut diamond Expired - Lifetime EP0587851B1 (en)

Applications Claiming Priority (3)

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

Publications (2)

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

Family

ID=6455837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93907771A Expired - Lifetime EP0587851B1 (en) 1992-04-02 1993-04-01 Cut diamond

Country Status (10)

Country Link
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)

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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

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Also Published As

Publication number Publication date
WO1993019635A1 (en) 1993-10-14
DE4210995C2 (en) 1997-04-03
US5454235A (en) 1995-10-03
ES2107014T3 (en) 1997-11-16
GR3025096T3 (en) 1998-01-30
DK0587851T3 (en) 1997-12-29
US5657647A (en) 1997-08-19
DE59306999D1 (en) 1997-09-04
EP0587851B1 (en) 1997-07-30
HK1001711A1 (en) 1998-07-03
JPH06507821A (en) 1994-09-08
DE4210995A1 (en) 1993-10-07
JP2758266B2 (en) 1998-05-28
DE9320280U1 (en) 1994-06-01
ATE155968T1 (en) 1997-08-15

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