Sapphire crystal
Version vom 21. Mai 2013, 01:26 Uhr von Torsten (Diskussion | Beiträge)
Glass made of artificially produced sapphire. It is very hard (9 on the Mohs scale) and scratch-resistant. It ranks just below the diamond in these two respects. Better watches often have a sapphire crystal which is highly resistant to scratching or shattering.