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<p>[QUOTE=&quot;Any Jewelry, post: 4519662, member: 2844&quot;]It has a very high density, which is why it is impossible to scratch with a knife. </p><p>The Mohs hardness of jadeite jade is 6.5-7, about the same as that of quartz and agate, and below that of precious gems. Diamonds have a hardness of 10.[/QUOTE]</p><p><br /></p>

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