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Gemstones, Minerals & Fossils
Lapidary
A Beginners Guide to Fascetting
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<blockquote data-quote="Lefty" data-source="post: 436629" data-attributes="member: 2976"><p>Lots <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /> </p><p></p><p>I wouldn't count on getting back more than about a third of the origninal rough weight, can often be even less. Stones rarely come in an ideal shape (diamonds are an exception I think) and there is a,ot of waste in an awkward, irregular shape. And then they may have included areas too bad to leave in that account for a fair amount of weight to be cut away.</p><p></p><p>Further, every type of transparent stone has a critical angle which must not be breached (there are exceptions to that rule, such as when you want to inscribe a picture inthe bottom) - there,s only so far you can fan out a design to fit wide, shallow rough, depending on the type of stone.</p><p></p><p>It's so,ething you have to learn to accept early on in faceting - yields are low, generally speaking.</p></blockquote><p></p>
[QUOTE="Lefty, post: 436629, member: 2976"] Lots :( I wouldn't count on getting back more than about a third of the origninal rough weight, can often be even less. Stones rarely come in an ideal shape (diamonds are an exception I think) and there is a,ot of waste in an awkward, irregular shape. And then they may have included areas too bad to leave in that account for a fair amount of weight to be cut away. Further, every type of transparent stone has a critical angle which must not be breached (there are exceptions to that rule, such as when you want to inscribe a picture inthe bottom) - there,s only so far you can fan out a design to fit wide, shallow rough, depending on the type of stone. It's so,ething you have to learn to accept early on in faceting - yields are low, generally speaking. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
A Beginners Guide to Fascetting
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