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Gemstones, Minerals & Fossils
Lapidary
Star sapphire advice needed
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<blockquote data-quote="Lefty" data-source="post: 121725" data-attributes="member: 2976"><p>Yep, they're resin-bonded diamond wheels Dug ( Cabking 6v3 machine).</p><p></p><p>Have been doing some looking up and found a site dedicated to star sapphires. They reckon that star sapphires should not be cabbed using any bonded diamond grits (either metal or resin) above #600 otherwise they have a tendency to an orange peeling effect. They apparently only use loose grits from that size up. Actually seems a bit counter-intuitive because in my short experience, it's loose grits that seem to have a greater tendency to undercut things. Guess sapphires must be an exception.</p><p></p><p>Not sure I have enough star sapphires to justify buying a bunch of different loose diamond grits in sizes I already have bonded to cabbing wheels and laps. But unlike the only other one I've done which was just a total bomb, this one seems much better and displays a nice,big even star.</p><p></p><p>Might just put her aside for awhile.</p></blockquote><p></p>
[QUOTE="Lefty, post: 121725, member: 2976"] Yep, they're resin-bonded diamond wheels Dug ( Cabking 6v3 machine). Have been doing some looking up and found a site dedicated to star sapphires. They reckon that star sapphires should not be cabbed using any bonded diamond grits (either metal or resin) above #600 otherwise they have a tendency to an orange peeling effect. They apparently only use loose grits from that size up. Actually seems a bit counter-intuitive because in my short experience, it's loose grits that seem to have a greater tendency to undercut things. Guess sapphires must be an exception. Not sure I have enough star sapphires to justify buying a bunch of different loose diamond grits in sizes I already have bonded to cabbing wheels and laps. But unlike the only other one I've done which was just a total bomb, this one seems much better and displays a nice,big even star. Might just put her aside for awhile. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Star sapphire advice needed
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