Method of coloring cut gemstones

Details Method of coloring cut gemstones Method of coloring cut gemstones

2006-04-25

2006-04-25

Meeks, Timothy (Department: 1762)

Coating processes

Heat decomposition of applied coating or base material

Coating decomposed to form metal

C427S593000, C427S250000

Reexamination Certificate

active

07033640

ABSTRACT:
A method of coloring cut gemstones introduces metals or metal oxides into a surface layer by means of heat treatment. During the heat treatment the gemstones are laid on a solid plate and the metals or metal oxides form a substantial constituent of the plate. The surface of the gemstone is protected from direct content with the metals and metal oxides in the plate by a layer containing non-coloring oxides.

REFERENCES:
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patent: 5791237 (1998-08-01), Gibson
patent: 5888918 (1999-03-01), Pollak
Coughlin, Donald G., Sri Lanka—A Gemstone Buyer's Dream, Gemology World—Canadian Institute of Gemmology, 1995.

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