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Mainspring Winder - Wrist & Pocket Watch
2 12½ Ligne
Harald Schneider "L2"
Horolovar brand are coiled undersized to slide easily into barrel drum
The ultimate jeweller's bench from Durston
6.01ct Oval Cabochon Star Sapphire 10.4x8.8mm ANDROID & WINDOWS Mainspring Winder - Wrist &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:
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