0.39ct Pear Shape Yellow Sapphire 4.9x3.9mm Witschi Chronoscope S1 (G2) without Microphone 12mm GP Clasp

12mm GP Clasp

4 sizes: 10

Repeatability: 1% of reading or 1°C

1 piece of each size

0.39ct Pear Shape Yellow Sapphire 4.9x3.9mm Witschi Chronoscope S1 (G2) without Microphone 12mm GP ClaspSapphire 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: