Method and apparatus for simplifying and improving consistency o

Details Method and apparatus for simplifying and improving consistency o Method and apparatus for simplifying and improving consistency o

1990-07-03

1991-04-09

Evans, F. L.

Optics: measuring and testing

Crystal or gem examination

356421, G01N 2187

Patent

active

050059718

ABSTRACT:
A color grading scale comprises a plurality of individual cast resin chips, each representative of a single color, with the chips attached one to another to form continuous array of color chips. In a preferred form, the chips are incorporated into a linear slide which fits within a groove formed in a surface of a frame. The frame is formed of a plastic material having a bright white color for maximum white light reflection. Formed in the frame adjacent to and spaced from the groove is at least one shallow pocket having a depth substantially the same as the groove for receiving a gemstone to be color graded by comparison to the color chips of the slide. Plural pockets of different sizes may be provided to accommodate different size stones.

REFERENCES:
patent: 4527895 (1985-07-01), Rubin
patent: 4534644 (1985-08-01), Beesley

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