Faceted gem cut from shallow gemstone material

Details Faceted gem cut from shallow gemstone material Faceted gem cut from shallow gemstone material

1985-09-04

1987-11-24

Johnson, Richard J.

Jewelry

Gem

D11 90, A44C 1700

Patent

active

047080019

ABSTRACT:
A faceted gem having a polished cone-shaped depression cut into the pavillion, said cone being concentric with the vertical axis of the gemstone, and having an included angle at the cone apex of about 90.degree., and a base diameter equal to about 50% of the girdle diameter. The thus-described polished cone surface reflects light entering the crown, providing a brilliance about equal to that of a correctly-cut gem having full depth of the pavillion. At the same time, the polished internal cone configuration of the pavillion permits a shallow stone to be cut to a maximum girdle diameter, such that the yield in stone size is increased by as much as 50% or more, as compared with the yield obtainable by cutting the pavillion in the conventional manner with correct main angles.

REFERENCES:
patent: De239534 (1976-04-01), Michaeli
patent: 712155 (1902-10-01), Seddon
patent: 2270270 (1942-01-01), Clare
patent: 3835665 (1974-09-01), Kitchel
patent: 4604876 (1986-08-01), Hoffmann

Affiliated with

Also associated with

Rating

Faceted gem cut from shallow gemstone material does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Faceted gem cut from shallow gemstone material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Faceted gem cut from shallow gemstone material will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2420973