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Ships within 48 hours · Estimated delivery Jul 28 - Aug 2
Variable speed 0 to 3450RPM (rotations per minute)
Automatic recognition of 11 testing positions
angle finder and level in one for horizontal and vertical measurement
Weight: 1130g
0.72ct Cushion Cut Sapphire 5.3x5.5mm Bergeon Rotation Machine Variable speed 0 to 3450RPMSapphire is a variety of the mineral corundum, an aluminium oxide. It is typically blue but fancy coloured sapphires also occur. The variety in colours is due to trace amounts of elements such as iron, titanium, chromium, copper and magnesium. Mohs Scale of Hardness: 9 (out of 10). Sources: Mines that have yielded the finest sapphires in colour and clarity are located in Kashmir, Myanmar and Sri Lanka. Nowadays the main sources of sapphires are: