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Pls identify this round black gemstone.Specific gravity is about 3.20.hardness around 9 to 10

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asked May 22 by Gopillm (810 points)
edited May 22 by Gopillm

1 Answer

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Sapphires, rubies and diamonds are the only things that are 9-10 on the Mohs scale. If you are accurate that means it must be one of those. Diamond spec grav is 3.5, sapphire and ruby are close to 4.0. Diamonds are closest to both parameters.
answered May 22 by Weasel (52,350 points)