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MOHS Hardness Scale
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Metalicious by Lauren - Whats your Birthstone?🤔 How 'hard' is your Birthstone?🤔 From Wikipedia: The Mohs scale of mineral hardness is a qualitative ordinal scale characterizing scratch resistance of various minerals through
GemAtlas - What is the scale used to measure the hardness of gemstones? The Mohs scale of mineral hardness was created by the German mineralogist Friedrich Mohs in 1822 to measure the