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Durston 1506
seam edge grinding process
Bergeon 2611--3
Measurement unit switchable: mm and mil
can set a high or a low humidity limit
7.31ct Oval Cabochon Star Sapphire 12.6x9.7mm hand press Durston 1506Sapphire 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:
