How to Identify an Uncut Rough Diamond Sciencing
Apr 30, 2018·Hardness Test. Diamonds can scratch every other mineral, but only diamonds can scratch diamonds. Quartz, the most likely mineral to be mistaken for diamonds in uncut rough form, ranks 7 on the Mohs Hardness Scale. Hardness test kits can be purchased, but they only test through Mohs Hardness 9, which is corundum.