Isaac Friedman

US Patent:

6430963, Aug 13, 2002

Filed:

Aug 30, 2000

Appl. No.:

09/649920

Inventors:

Isaac Friedman - New York NY
Philip Katz - New York NY

Assignee:

Simka Diamonds Corporation - New York NY

International Classification:

A44C 1700

US Classification:

63 32, D11 89, D11 90

Abstract:

A brilliant gemstone cut, having a crown, a girdle and a pavilion. The crown and the pavilion are both brilliant cut. The crown has a flat table shaped as an equilateral n-sided polygon, n corner facets and n upper girdle facets. The girdle is also shaped as an n-sided polygon. The pavilion has n rib lines, which converge at a culet, n lower girdle facets, n bezel star facets and double n number of corner facets. The rib lines subdivide the pavilion into n equivalent parts.

US Patent:

7225642, Jun 5, 2007

Filed:

Sep 9, 2003

Appl. No.:

10/658316

Inventors:

Philip Katz - New York NY, US
Isaac Friedman - New York NY, US

Assignee:

Simka Diamonds - New York NY

International Classification:

A44C 17/00

US Classification:

63 32, D11 89, D11 90

Abstract:

A brilliant gemstone cut, having a crown, a girdle and a pavilion. The crown has a flat table shaped as an equilateral n-sided polygon. The girdle is also multi sided polygon. The corner, lower girdle, bezel and star facets are at significantly angles of inclination, with respect to the table to provide significantly improved brilliance. The upper corner facets are spaced from the girdle. The space between the corner facet vertices and the girdle is left open to be covered by a prong of a jewelry setting.

US Patent:

D4474406, Sep 4, 2001

Filed:

Sep 25, 2000

Appl. No.:

D/129909

Inventors:

Isaac Friedman - New York NY
Philip Katz - New York NY

Assignee:

Simka Diamonds Corporation - New York NY

International Classification:

1101

US Classification:

D11 90