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Re:A Huge Diamond Mine That Helped Build The Soviet Union (2... by ericfranklin on Tuesday July 11, 2017 @07:56PM (#14749093)
The testers a typical jeweler or diamond merchant might use only identify between diamond, cubic zirconia or moissanite. They do not identify origin of a diamond.

The testers that can identify a diamond's origin are quite expensive and usually only found at major gemological labs.

All synthetic white diamonds are "Type IIa" (no or trace amounts of nitrogen) while only 1-2% of mined diamonds are IIa. 97% of mined diamonds are "Type Ia" (clusters of nitrogen). It is possible that is what they were referring to about purity, but the amount of nitrogen is not a definitive indicator of origin.

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