4.29ct Oval Faceted Sapphire Certified Unheated 11.6x6mm Magnetic Tumbler 100g 26 x 720 x 21mm

26 x 720 x 21mm (to fit Imhof 544)

01 to 119351

Machine washable

9 RPM) / 1RPM(above 1000RPM)

continuous working time 2 hours

4.29ct Oval Faceted Sapphire Certified Unheated 11.6x6mm Magnetic Tumbler 100g 26 x 720 x 21mmSapphire 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: