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What are the three hardest stones or rocks on the planet i know diamond is the hardest what are two and three and where does quartz feature on the list please?
Wiki User
∙ 12y ago
Corundum & samphire
Wiki User
∙ 12y ago
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What is the hardest gemstone?
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What is the hardest gemstone?
Hardness - Hardness may be defined as a material's resistance to scratching. The diamond is the hardest gemstone and the hardest substance known in nature. Nothing can scratch a diamond except another diamond. However, diamonds and many other "hard" gemstones can chip.(Please see the Related Link below.)
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