Bristol Stone/Bristol Diamond
Old trade-term for colorless crystal quartz. Also a trade name for colored glass imitations, Bristol Glass or Bristows.
Bruting
A method of rough-diamond fashioning by rubbing one diamond against another.
Colorless quartz, referred to as crystal or "Bristol Stones" began to be used extensively. It was harder and more durable than paste. Could be used to "cap" items such as gold "cyphers" and hair.
c. 1760s
Paul Revere ...
 See also: Gemstone, Jewel, Glass, Foil Backed, Colored Stones
  
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