Pearl loupe

Details Pearl loupe Pearl loupe

1991-06-19

1992-09-08

Evans, F. L.

Optics: measuring and testing

Crystal or gem examination

G01N 2187

Patent

active

051462885

ABSTRACT:
The invention relates to an apparatus for distinguishing cultured pearls from natural pearls by piercing the unidentified pearls with beams of light, preferably polarized, to reveal gross structural differences. The apparatus uses a light source, a polarizing filter, opaque shields, micro ports for light limitations, field magnifying lenses preferably 10.times.or 12.times., and slides and other positioners to hold pearls singly or in strings.

REFERENCES:
patent: 4906083 (1990-03-01), Sattler

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