Identification of gemstones by relative reflectance measurements

Details Identification of gemstones by relative reflectance measurements Identification of gemstones by relative reflectance measurements

1976-03-10

1977-03-15

LaRoche, Eugene R.

Optics: measuring and testing

Crystal or gem examination

356209, 356212, G01N 2148

Patent

active

040121410

ABSTRACT:
This invention embodies a novel concept in the confirmation of the identification of faceted gemstones and an instrument which makes this concept practical and useful.
The concept is that it is not necessary to determine the refractive index (n.sub.D) of a gem in order to identify it if one has an instrument capable of determining the ability of that gem to reflect light relative to the ability of other gems to reflect light. With this invention, an individual completely unskilled in the science of gemology, can almost instantaneously determine if a gem is indeed what it is purported to be.

REFERENCES:
patent: 3751162 (1973-08-01), Long

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