Method of coloring cut gemstones
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United States of America Patent
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Apr 25, 2006
Grant Date -
Jul 3, 2003
app pub date -
Dec 12, 2002
filing date -
Dec 27, 2001
priority date (Note) -
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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.
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