3.67ct Cushion Cut Pale Blue Sapphire 11x7.2mm Horotec Swiss Spring Bar Curving Tool Overall size: 290 x 85

Overall size: 290 x 85 x 40mm

Holds cases from Ø28 to Ø45mm

detailed work

00mm (inverted)

3.67ct Cushion Cut Pale Blue Sapphire 11x7.2mm Horotec Swiss Spring Bar Curving Tool Overall size: 290 x 85Sapphire 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: