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Gemstones, Minerals & Fossils
Lapidary
Approx 100ct Topaz Gem quality (TBC)
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<blockquote data-quote="Lefty" data-source="post: 324441" data-attributes="member: 2976"><p>As others have stated, topaz is both harder and heavier than quartz and has perfect cleavage across the base of the crystal while quartz has no cleavage.</p><p></p><p>As a rough guide you could try scratching it with a quartz crystal, you should have difficulty scratching it.</p><p></p><p>Also, it's clearly a well-formed crystal, just weathered. While shapes aren't always perfect, the cross-section of a quartz crystal is hexagonal while that of a topaz crystal is four-sided and looks sort of like a flattened diamond shape (as in the diamond on a playing card, actual diamond crystals look like two pyramids joined end to end).</p><p></p><p>If it turns out to be clean it should cut a pearler of a stone <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Even if only some of it is clean it will still cut a nice stone, possibly more than one. I like topaz, some refer to it as "poor man's diamond" <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> but that doesn't do it justice, it cuts a very bright, lively stone that wears well in jewellery.</p></blockquote><p></p>
[QUOTE="Lefty, post: 324441, member: 2976"] As others have stated, topaz is both harder and heavier than quartz and has perfect cleavage across the base of the crystal while quartz has no cleavage. As a rough guide you could try scratching it with a quartz crystal, you should have difficulty scratching it. Also, it's clearly a well-formed crystal, just weathered. While shapes aren't always perfect, the cross-section of a quartz crystal is hexagonal while that of a topaz crystal is four-sided and looks sort of like a flattened diamond shape (as in the diamond on a playing card, actual diamond crystals look like two pyramids joined end to end). If it turns out to be clean it should cut a pearler of a stone :) Even if only some of it is clean it will still cut a nice stone, possibly more than one. I like topaz, some refer to it as "poor man's diamond" :) but that doesn't do it justice, it cuts a very bright, lively stone that wears well in jewellery. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Approx 100ct Topaz Gem quality (TBC)
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