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"Will Moissanite test positive as a diamond?"

Moissanite will test positive using a traditional thermal diamond tester (as found in most jewelry stores).  The reason is due to the very similar heat signature of Moissanite and diamond stones.  

Due to differences in the crystal between the newest Moissanite and older Moissanite, newer Moissanites will often test positive as diamond using older Moissanite testers. 

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