3.13ct Octagon Cut Sapphire 9x7.4mm 12 litre "Rota Barrel" Variable Speed Great for all types of

Great for all types of detail work in both hard and delicate materials

When set upper and lower limit value

Bergeon 1896H: Ø0

notched or with holes

Double Flange

3.13ct Octagon Cut Sapphire 9x7.4mm 12 litre "Rota Barrel" Variable Speed Great for all types ofSapphire is a variety of the mineral corundum, an aluminium oxide. It is typically blue but fancy coloured sapphires also occur in orange, yellow, green, brown, purple, pink, black and colourless. Red and reddish pink coloured corundum is referred to as ruby. 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