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    Rough Ruby, sapphire and Corundum  identification measuring hardness using HMKIS diamond testerπŸ”₯πŸ’ŽπŸ”₯πŸ’Ž

    Rough Ruby, sapphire and Corundum identification measuring hardness using HMKIS diamond testerπŸ”₯πŸ’ŽπŸ”₯πŸ’Ž

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