Women Fashion Jewellery Opal Silver Locket.
Australia
The town of Coober Pedy in South Australia is a major source of opal. The world's largest and most valuable gem opal "Olympic Australis" was found in August 1956 at the "Eight Mile" opal field in Coober Pedy. It weighs 17,000 carats (3.4 kg; 7.5 lb) and is 11 inches (280 mm) long, with a height of 4 3⁄4 in (120 mm) and a width of 4 1⁄2 in (110 mm).
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