Assessing the color of gemstones and the like

Details Assessing the color of gemstones and the like Assessing the color of gemstones and the like

1981-06-10

1984-07-24

Evans, F. L.

Optics: measuring and testing

Crystal or gem examination

250228, 356408, 356236, G01J 350

Patent

active

044615680

ABSTRACT:
The color of gemstones or the like is assessed by projecting light onto the stone, using an interrupting member to regularly interrupt the path of the light shortly before it reaches the stone, the member having a normally white, diffusing interrupting surface, and using a detector for detecting the color of the light coming from the gemstone and from the interrupting surface of the interrupting member. Preferably, the stone is mounted in a chamber having normally white, diffusing internal walls and the diffusing interrupting surface is within the chamber.

REFERENCES:
patent: 2960909 (1960-11-01), Shipley, Jr.
patent: 3463596 (1969-08-01), Selgin
patent: 3751162 (1973-08-01), Long
patent: 3838926 (1974-10-01), Kato et al.
patent: 4259011 (1981-03-01), Crumm et al.
Galuza et al., Instrum. & Exp. Tech. (USA), vol. 19, No 4, Jul.-Aug. 1976, Published Feb. 1977, pp. 1157 and 1158.

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