off-color Insufficient color, or saturation, in a diamond to be considered good color. Used to describe colorless diamond with a strong tint of yellow.
Off-color diamond: Any diamond that has a tinge of undesirable color, especially yellowish, brownish or grayish.
Old-mine cut: An early form of a brilliant-cut with a nearly square or cushion-shape outline. Not to be confused with European-cut.
emeralds, it is true, but of wretched quality - into the crevices of which coloring matter has been forced and, in addition, the outside perhaps coated with a green chemical made to adhere to the stone by a kind of varnish; that an off-color pearl ...
These colors are normally produced from off-color stones in undesirable shades.
Radiation treatment exposes off-color diamonds or slightly tinted stones to certain types of radiation to create a fake fancy-colored diamond.
The 'Flower Cut' series was created by Gabi Tolkowsky in 1986, who was commissioned by De Beers to create new cuts as a way of marketing unusual, off-color stones.
Coated to disguise off-color
Filling of surface cavities or fractures with a hardened substance
Use of heat with pressure to alter color and/or clarity
Laser drilled to improve appearance ...
If you notice bad breathe and an off-colored tongue the mouth wash may have killed the mouth's own bacteria. If this happens switch to salt water rinses instead of mouthwash.
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Perhaps the most nefarious of the fraudulent uses of coating is an old (but still in use) trick of putting a tiny drop of indelible blue ink or paint underneath the prongs holding an off-color diamond in its setting.
The painted stone may be detected by washing it with alcohol, when the dye will be removed and the off-color will become apparent. If the stone is unset one can see with a lens a wavery metallic appearance on the surfaces that have been "painted.
 See also: Color, Stone, Diamond, Natural, Gem
  
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