Dead Spot
An industry term that refers to a gemstone that has dull areas or areas that poorly reflect the light.
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Dead Spot
Part of a gemstone that has dull areas, or areas that poorly reflect the light
Deco Style ...
window Sometimes dead spots in polished diamonds are referred to as windows. Many times the skin of a rough diamond is too opaque for the cutter to locate inclusions which may affect the layout of the diamond.
Potch...native material in or around a gemstone, a dead spot or area. ie: ironstone surrounding opal.
Radioactive...Emitting alpha, beta, or gamma rays.
 See also: Shape, Calcium, Carbon, Diamond, Iron
  
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