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The field test for diamond is 'extreme hardness'.

If you believe that you've found a diamond stone, you can take it to a jeweler, who will apply a probe and verify your find as a diamond stone, or not.

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12y ago
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14y ago

Diamond will scratch quartz, quartz will not scratch diamond. Better yet, garnet or corundum sandpaper will scratch quartz, but not scratch diamond.

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Q: How do you tell if a rock is a diamond?
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A raw diamond will have a rough, unpolished surface with a dull appearance. It may also appear cloudy or opaque due to impurities. If you are unsure, it is best to have the diamond evaluated by an expert gemologist.


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