Gemstone and method for producing the same

Patent metadata

Field	Value
Publication number	US-11000102-B2
Application number	US-201815917907-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Mar 21, 2017
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

A method for producing a gemstone, in particular a diamond, in the shape of a star with several arms, the method including taking a basic, brilliant cut gemstone, the gemstone including a basic crown, a basic pavilion and a basic girdle joining the basic crown and the basic pavilion and defining a plane, cutting a plurality of facets in the respectively basic crown, pavilion and girdle, to obtain a transformed gemstone delimited by a periphery, laser cutting the periphery of the transformed gemstone to produce the star shape.

First claim

What is claimed is:

1. A gemstone comprising:
a crown surmounted by a table;
a pavilion; and
a girdle at an intersection of the crown and the pavilion,
wherein said gemstone is cut in the form of a star with several arms, a height between the table and a free end of the pavilion being less than 2 mm,
wherein the table is in the shape of a pentagon, and
wherein the gemstone further comprises
a first series of five facets, each of the five facets having at least a first side and a second side, the first side of each of the five facets sharing a respective side with the pentagon, the second side of each of the five facets is located opposite the first side and an entire length of the second side is connected to the girdle;
a second series of five rhombus facets each sharing a vertex with a vertex of the pentagon and sharing two sides with adjacent facets of the first series;
a third series of ten triangular facets each sharing one side with a rhombus facet of the second series;
a fourth series of five quadrangular facets each sharing a vertex with a respective rhombus facet of the second series and sharing two sides with adjacent triangular facets of the third series; and
each of the several arms includes a free end, each of the free ends is formed only by a respective quadrangular facet of the fourth series, and each free end is double beveled to facilitate setting the gemstone without risk of breaking the ends.

2. The gemstone according to claim 1 , wherein the several arms includes five arms of the same dimensions offset by 108°.

3. The gemstone according to claim 1 , wherein a length between one end of a first arm of the several arms and a midpoint between ends of two arms of the several arms that are opposite the first arm is between 1 and 3 mm.

4. The gemstone according to claim 1 , comprising, in addition to the table, 20 or 25 facets in the crown and 25 facets in the pavilion.

5. The gemstone according to claim 1 , comprising, at the center of the pavilion, two concentric stars visible through the table.

6. A dial comprising an aperture delimiting a contour in the shape of star with several arms, said aperture receiving a setting for setting the gemstone according to claim 1 .

7. The dial according to claim 6 , wherein the aperture further includes a step forming a bearing surface for the setting at a periphery of each of the several arms of the aperture.

8. The dial according to claim 6 , comprising a mother-of-pearl layer that surrounds the setting and is externally visible.

9. The dial according to claim 6 , comprising the gemstone and the setting.

10. A setting comprising a housing in the shape of a star with several arms intended for setting the gemstone according to claim 1 .

11. The setting according to claim 10 , comprising a base surmounted with said housing, the base having a star shape with truncated arms delimiting a contact surface intended to rest on a dial.

12. A watch including the dial according to claim 6 .

13. The watch according to claim 12 , comprising the setting, said setting being secured to the dial by an adhesive joint and resting in a plane formed by an inner face of the dial.

Assignees

• Omega Sa

Inventors

• Monachon Jean-Claude

Classifications

• G04B47/042

  Fastening of jewels and the like (set on or into numbers G04B19/103; jewel bearings G04B31/008; setting of jewels and tools therefor A44C; devices for setting jewel bearings G04D3/04) · CPC title

• B28D5/00 Primary

  Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor (working by grinding or polishing B24; for artistic purposes B44B) · CPC title

• A44C17/001 Primary

  Faceting gems · CPC title

• A44C17/005

  Gems provided with grooves or notches, e.g. for setting · CPC title

• A44C17/04

  Setting gems in jewellery; Setting-tools · CPC title