Imitation Precious Stones: Altered Stones
The practice of using genuine but inexpensive gem material (such as chalcedony and quartz) and altering it to look like a more precious gem ...
Altered Stone
Any stone that has been changed in appearance, particularly in color, by an artificial process. Also referred to as an Enhanced Gemstone or a Treated Gemstone.
This way you'll know you're buying a Diamond that's been Clarity Enhanced (which should make the Diamond cheaper). The Jewelry Industry frowns upon this process because some people are purchasing altered stones and don't know it.
 See also: Color, Make, Diamond, Stone, Rough
  
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