Natural untreated solid Australian black opal from Lightning Ridge area set in 925 silver pendant on 925 silver chain. Opal: 3 carat, 14x10x4mm, body tone N3 - black opal. It was cut in Netherlands from opal imported from Australia. Silver chain is 50cm long. Australian opals are stable and do not require any special care, they do not care about humidity and are not affected by contact with any liquids, avoid scratching them during hard labor or when exercising and they will last for a very long time.