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Gemstones, Minerals & Fossils
Gemstones and Minerals
Diamonds in Australia
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<blockquote data-quote="user 4386" data-source="post: 640777" data-attributes="member: 4386"><p>Personal experience can be a dangerous thing, but I have never seen a diamond that is so well rounded (see photo of alluvial diamonds). Usually the surface is not so smooth and is irregular, because being the hardest natural substance, there is nothing smoother to grind it down, so shape modification is usually by chipping, and often the octahedral shape is preserved to at least some degree.</p><p></p><p>Nothing obvious to show it is a macle (twin). Hardness is the best test - many things cut glass easily. A bit of corundum is usually easily come by and if that does not scratch it (but it scratches the corundum) you would know it is diamond.</p><p></p><p>Looks like major flaws present, but I am not an expert on that.</p><p></p><p>[ATTACH=full]877[/ATTACH]</p></blockquote><p></p>
[QUOTE="user 4386, post: 640777, member: 4386"] Personal experience can be a dangerous thing, but I have never seen a diamond that is so well rounded (see photo of alluvial diamonds). Usually the surface is not so smooth and is irregular, because being the hardest natural substance, there is nothing smoother to grind it down, so shape modification is usually by chipping, and often the octahedral shape is preserved to at least some degree. Nothing obvious to show it is a macle (twin). Hardness is the best test - many things cut glass easily. A bit of corundum is usually easily come by and if that does not scratch it (but it scratches the corundum) you would know it is diamond. Looks like major flaws present, but I am not an expert on that. [ATTACH type="full" alt="1649733973649.png"]877[/ATTACH] [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Diamonds in Australia
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