Guest guest Posted May 27, 2008 Report Share Posted May 27, 2008 In my practice I have seen that a one carat fine ruby is the same strength as a 3 carat fine red spinel (of same color) Or a 6 carat white Sapphire is equal to a 0.60 carat fine diamond. And so on... Quote Link to comment Share on other sites More sharing options...
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