Proportionscope A proprietary piece of equipment for assessing, demonstrating, and measuring the proportions of diamonds, and comparing them with ideal.
Purity Another word for clarity.
Proportionscope - The Proportion Scope combines lenses and movable mirrors to project the silhouette of a diamond on a screen.
proportionscope First designed and manufactured by GIA in 1967. It is an instrument that casts a silhouetted image of a diamond that allows us to check the exact proportions of the subject.
quartz Number 7 on the Mohs' hardness scale.
Although in principle the proportion of crown to pavilion should have the same tolerances in a fancy cut as in a brilliant, one occasionally can be surprised by the measurements read off the PROPORTIONSCOPE.
 See also: Culet, Square, Polish, Proportions, Rough diamond
  
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