Quality indicator for gemstone

Details Quality indicator for gemstone Quality indicator for gemstone

1990-06-25

1991-10-15

Yost, Frank T.

Printed matter

Method

283115, 283117, B42D 1500

Patent

active

050568264

ABSTRACT:
The present invention relates to a quality indicator for a gemstone and more particularly to such a quality indicator for a gemstone composed of a chart with coloration in a plurality of colors and an indication of a grading scale in terms of the grades expressed in and with reference to the colors of the chart.

REFERENCES:
patent: 935474 (1909-09-01), Eckart
patent: 2636286 (1953-04-01), Bowman
patent: 2899755 (1959-08-01), Terilli
patent: 4523852 (1985-06-01), Bauer
patent: 4527895 (1985-07-01), Rubin

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