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Australian opal has been cited as accounting for 95–97% of the world's supply of precious opal, [24] [25] with the state of South Australia accounting for 80% of the world's supply. [26] In 2012, Ethiopian opal production was estimated to be 14,000 kg (31,000 lb) by the United States Geological Survey. [ 27 ]
Deep Blue Sea is a hat designed by Australian milliner, Ann-Maree Willett, which is made from Australian wool felt and set with 26 precious opals from Lightning Ridge, weighing a total of 1447.5 carats. Deep Blue Sea was the feature piece of the ‘Climate’ series of hats that launched Willett's international millinery career.
Some jewellery is plated to give it a shiny, reflective look or to achieve a desired colour. Sterling silver jewellery may be plated with a thin layer of 0.999 fine silver (a process known as flashing) or plated with rhodium or gold. Base metal costume jewellery may also be plated with silver, gold, or rhodium for a more attractive finish.
In Ancient Babylon, necklaces were made of carnelian, lapis lazuli, agate, and gold, which was also made into gold chains. [6] Ancient Sumerians created necklaces and beads from gold, silver, lapis lazuli and carnelian. [6] In Ancient Egypt, a number of different necklace types were worn.
Precious metals such as gold, silver, and platinum have been used for millennia to create objects of cultural and artistic significance. In jewelry, they are a cornerstone for crafting wedding bands, engagement rings, and ceremonial adornments, often symbolizing love, commitment, and social status. [11] [12] [13]
The Olympic Australis opal is the largest and most valuable opal yet found (as of 1961) [1] and was valued at A$2,500,000 in 1997. [2] It was found in 1956 at the 'Eight Mile' opal field near the town of Coober Pedy in South Australia. [3] The opal was found at a depth of 9.1 metres (30 ft).
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