U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Jewel having multiple culets

Patent 5657646 Issued on August 19, 1997. Estimated Expiration Date: Icon_subject October 4, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

D196868

D277942

D340667

D340668

Brilliantized step cut stone
Patent #: 4118949
Issued on: 10/10/1978
Inventor: Grossbard

Brilliantized step cut stone with faceted crown
Patent #: 4118950
Issued on: 10/10/1978
Inventor: Grossbard

Chrysoberyl gemstones
Patent #: 4306427
Issued on: 12/22/1981
Inventor: Urban

Step-cut stone which has been brilliantized
Patent #: 4555916
Issued on: 12/03/1985
Inventor: Grossbard

Faceted gem cut from shallow gemstone material
Patent #: 4708001
Issued on: 11/24/1987
Inventor: Alburger

Method of facetting a gem Patent #: 5462474
Issued on: 10/31/1995
Inventor: Hansen

Inventor

Application

No. 318058 filed on 10/04/1994

US Classes:

63/32GEM

Examiners

Primary: Milano, Michael J.

Foreign Patent References

  • 1005060 GB 09/11/1965

International Class

A44C 017/00

Abstract

A gem cut with crown facets and base facets has a table and a principal culet located along the longitudinal axis of the gem. In addition, at least one additional culet is provided between the end of the gem and the principal culet. Extending from the extra culet to the end of the diamond, at the girdle, is an end base facet. Preferably, the end base facet is at the 41° desired angle for diamonds. As so cut, the gem exhibits enhanced brilliance and the bow-tie dullness associated with side split facets is reduced resulting in overall enhanced brilliance to the stone. In the preferred embodiment of the invention, the girdle of the stone is provided with eight straight edges and the girdle is symmetrical about both the longitudinal axis and the perpendicular cross axis. In this embodiment, a pair of extra culets and end base facets are provided. According to the preferred embodiment of the invention, the end base facets are further provided with end base split facets for further enhanced brilliance.

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