0.43ct Cushion Cut Bi-Colour Sapphire 4.4x3.7mm Zenith 400 Series Movement Holder Weight 650g

Weight 650g

20 x 550 x 17mm (to fit Looping 50/51 (8 day) - Time side

15 reamers

Double side dies 40/42

0.43ct Cushion Cut Bi-Colour Sapphire 4.4x3.7mm Zenith 400 Series Movement Holder Weight 650gSapphire 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: