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Gemstones, Minerals & Fossils
Lapidary
Star sapphire cabbing orientation
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<blockquote data-quote="Splinter" data-source="post: 477462" data-attributes="member: 10000"><p>Update: Had a crack at the sheen optimisation method on a black star. The rough was highly irregular, and somewhat translucent under strong back-lighting. Had I oriented the stone by the crystal growth outlines, I would have got it wrong by a long way by looking at the finished product. Sheen optimisation worked well for centering, so, I will try the method again to make sure it wasn't a fluke. However, I cabbed with a high dome and ended up with a dot under normal indoor lighting conditions and a faint star under sunlight. Lesson learned, my next black star will be shallow (re-cut for proof will be in order). Making a lot of errors, but learning from each one. I'm starting to chew through the rough, but good use of the lower grade material in my opinion. One other point of interest, I am starting to see that a good cut star will stand out in the rough. I have thousands of piecces of rough and the first one I cabbed had a good star. The next five....not so much or at all. What are the odds of that. Little fellow stood out like a</p><p> sore thumb.</p></blockquote><p></p>
[QUOTE="Splinter, post: 477462, member: 10000"] Update: Had a crack at the sheen optimisation method on a black star. The rough was highly irregular, and somewhat translucent under strong back-lighting. Had I oriented the stone by the crystal growth outlines, I would have got it wrong by a long way by looking at the finished product. Sheen optimisation worked well for centering, so, I will try the method again to make sure it wasn't a fluke. However, I cabbed with a high dome and ended up with a dot under normal indoor lighting conditions and a faint star under sunlight. Lesson learned, my next black star will be shallow (re-cut for proof will be in order). Making a lot of errors, but learning from each one. I'm starting to chew through the rough, but good use of the lower grade material in my opinion. One other point of interest, I am starting to see that a good cut star will stand out in the rough. I have thousands of piecces of rough and the first one I cabbed had a good star. The next five....not so much or at all. What are the odds of that. Little fellow stood out like a sore thumb. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Star sapphire cabbing orientation
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