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Will a synthetic blue saphire give any reading on a diamond tester?

+1 vote
Imhave what i believe to be a blue saphire, when i use my diamond tester it moves the bar up 4 spaces, i have the diamond tester set at 4 due to the stone is a 19ct cushion cut, if i use the tester right after it has charged it will move the bar up to 8, if i let the tester sit for 10 min it will sometimes test as a diamond. I am curious as to if a synthetic blue saphire will produce any significant reading on a diamond tester?
asked Dec 2, 2015 by Duude Whiting (190 points)

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