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gemstone hardness
https://gemologyonline.com/Forum/phpBB2/viewtopic.php?f=12&t=14543
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Author:  Barbra Voltaire, FGG [ Fri Oct 23, 2020 1:13 pm ]
Post subject:  Re: gemstone hardness

Hi GemsFan.
Your post didn't come out correctly.
What instrument have you been using with reliable results?

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