Process for imparting and enhancement of colours in gemstone...

Details Process for imparting and enhancement of colours in gemstone... Process for imparting and enhancement of colours in gemstone...

2005-03-29

2005-03-29

Parker, Fred J. (Department: 1762)

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

C427S255310, C427S255700, C427S383300, C501S086000

Reexamination Certificate

active

06872422

ABSTRACT:
The present invention provides a process for imparting colors to colorless gemstone/minerals and enhancing properties of gemstone/minerals by coating a thin/thick film of a particular material or multiple films of different materials on polished gemstones/minerals to impart color in colorless stones and to enhance the color in paler stones, and to such gemstones/mineral obtained by the process.

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Kane et al., “The Identification of Blue Diffusion-Treated Sapphires,” Gems & Gemology (Summer 1990), pp. 115-133.
McClure et al., “Update on Diffusion-Treated Corundium: Red and Other Colors,” Gems & Gemology (Spring 1993), pp. 16-27.

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