WEBRead this article on laps and techniques for polishing gemstones again to see if there is anything you have overlooked. Try a 3,000 prepolish. Use very gentle pressure at all stages. You can't go directly from the coarse lap to the 3,000, so use a 600 or 1,200 inbetween. Try some new diamond bort.
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WhatsApp: +86 18203695377WEBemery. shamir. water sapphire. corundum, naturally occurring aluminum oxide mineral (Al 2 O 3) that is, after diamond, the hardest known natural substance. Its finer varieties are the gemstones sapphire and ruby ( ), and its mixtures with iron oxides and other minerals are called emery ( ). Corundum in its pure state is colourless ...
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