Diamond cutting method and new-cut diamond shape

Patent 6397832 Issued on June 4, 2002. Estimated Expiration Date:

November 7, 2020. 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.

Abstract Claims Description Full Text

Patent References

732119

839356

3534510

3585764

Method for cutting ornamental transparent gemstones and products produced therefrom
Patent #: 4083352
Issued on: 04/11/1978
Inventor: Andrychuk

Process for cutting a diamond to provide an invisible mounting
Patent #: 4738240
Issued on: 04/19/1988
Inventor: Aich

Diamond sawing process
Patent #: 5190024
Issued on: 03/02/1993
Inventor: Senanayake

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

Inventor

Shuto, Naotake

Application

No. 706715 filed on 11/07/2000

US Classes:

125/30.01, PRECIOUS STONE WORKING63/32, GEM125/39, Diamond451/41Glass or stone abrading

Examiners

Primary: Nguyen, George

Attorney, Agent or Firm

Rader, Fishman & Grauer, PLLC

Foreign Patent References

09-011105 JP. 01/13/1997

International Class

B28D 005/00

Abstract

Disclosed are a new diamond cutting method and a diamond shape or proportion giving an increased brightness and different brilliant colors to the cut jewel. A piece of diamond having a crown or bezel and a pavilion converging up and down from its girdle is prepared; the table of the crown is cut into a regular polygon having straight sides of an integer multiple of three; star facets, upper-main facets and paired upper-girdle facets are formed on the oblique annular surface between the polygonal table and the girdle; and lower-girdle facets and lower-main facets are cut on the pavilion. The height of the diamond piece is approximately 64% of the diameter of the girdle; the height of the crown is approximately 15.7%; the height of the pavilion is approximately 48.3%; and the largest width of the girdle is approximately 1.2 to 1.4%. The angle formed between the ridge of the crown and the ridge of the pavilion is approximately 77 degrees.