Diamond bearing microscopic certificate of appraisal

Details Diamond bearing microscopic certificate of appraisal Diamond bearing microscopic certificate of appraisal

1976-04-01

1977-11-08

Shay, F. Barry

Jewelry

Gem

40 22, 156664, A44C 1700

Patent

active

040569527

ABSTRACT:
A diamond with an inscription comprises a diamond gem structure having an outer surface cut and polished into a specific shape and a microscopic inscription formed at a specific position on the outer surface of the diamond gem structure. The inscription has a pattern indicating the results of expert appraisal of the diamond gem structure. The inscription may be formed by a method including cleaning a selected portion of the stone surface, depositing a layer of metal thereon, coating the metal with a photoresist film, producing thereon a photo impression by using a mask, developing the impression, etching away the uncoated metal portions and then removing the photoresist.

REFERENCES:
patent: 1902830 (1933-03-01), Bulova
patent: 2093601 (1937-09-01), Drescher
patent: 3571957 (1971-03-01), Cumming
patent: 3576630 (1971-04-01), Yanagawa
patent: 3959527 (1976-05-01), Droege

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