Coated Diamond: A diamond colored by a surface coating which masks the true body-color; the coating may be extensive (entire pavilion, for example), but is more often limited to one or two pavilion facets or a spot on the girdle. ...
Coated diamond: Also - painted diamond. A diamond that has been coated with a substance that imparts a bluish color to mask a yellowish body color. Painting diamonds is a deceptive practice.
Coated Diamond
A diamond colored by a surface coating which masks the diamond's true body color. Coating may be used extensively to entire pavilion or limited to one or two pavilion facets or a spot on the girdle.
Color ...
Cloud: A group of tiny white inclusions which result in a milky or cloudy appearance.
Coated Diamond: A diamond colored by a surface coating which masks the true body-color.
Summer 1964, Coated Diamonds, by E. Miles, p. 163, 6pp.
Summer 1964, A cross of diamond doublets, p. 181, 1p.
Winter 1964, Twin lines and crystal growth lines, p. 252, 1p.
Example: coated diamond
D = Dyeing (staining): The introduction of coloring matter into a gemstone to give it new color, intensify existing color or improve color uniformity. Example: dyed green jadeite ...
C = Coating: Application of an artificial layer to the surface. Example: Coated diamond, coated topaz
Bleaching ...
 See also: Surface, Color, Diamond, Table, Jewelry
  
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