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How to get ctw of a colored mounted stone?

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ger100

Shiny_Rock
Joined
Sep 24, 2006
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172
Hi,

Can someone point me to a site which shows how to get the ctw of a colored mounted stone? (without removing it from mounting).
I know how to do a diamond from Matlins guide.
Is there anyway to use a percent of the SG of the stone and relate it to that of diamond, perhaps??

Thanks
Ger
 
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