Oval Oyster Copper Turquoise Ring - Natural Designer GemstoneStylish & fun Silver and Oyster Copper Turquoise Statement Ring. Handset in 925 Sterling Silver, this exquisite Oyster Copper Turquoise gemstone is Oval in shape and has the colours of the ocean and sun with blue and orange as the dominant colours with flashes of copper running through it. The Oyster Copper gemstone is found in the western Atlantic Ocean, the Caribbean Sea and Gulf of Mexico where it is found at depths between 9 and 45 meters. It is