T tnmanboy Rough_Rock Joined Jun 30, 2011 Messages 1 Jun 30, 2011 #1 What is the difference between 'gem-grade' diamonds vs 'commercial grade' diamonds (distinct from 'industrial grade' diamonds). This doesn't seem to be universal lingo.
What is the difference between 'gem-grade' diamonds vs 'commercial grade' diamonds (distinct from 'industrial grade' diamonds). This doesn't seem to be universal lingo.
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