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How to spot treated opal

This week Justin will take you through some obvious and not so obvious differences between natural Australian black opal and treated black opal. Key factors on how to spot a fake — Polish — treated opal doesn’t have a high polish, ripples are usually present on the outside of the gem. Double-Sided — natural black opals can be double-sided but most treated opals are double-sided and are cut with an obvious sharp edge from the dome to the back. Red on Black — when you see a lot of black in the gem it’s a red flag — most treated opals sit around an N1 or N2 with flecks of…

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