5.96ct Octagon Cut Bi-Colour Green Sapphire Certified Unheated 13.1x8mm Seiko Beep Alarm 6.2mm (NEF) Shaft Movement Set of 13 includes:

Set of 13 includes:

Cut 126 for general use

Response Time and Wave Length: less than 500ms 8-14μm

5cm / 2 * 2 * 1in

5.96ct Octagon Cut Bi-Colour Green Sapphire Certified Unheated 13.1x8mm Seiko Beep Alarm 6.2mm (NEF) Shaft Movement Set of 13 includes:Sapphire 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: