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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).
The brightness of the fire in opal ranges on a scale of 1 to 5 (with 5 being the brightest) [13] "Girasol opal" is a term sometimes mistakenly and improperly used to refer to fire opals, as well as a type of transparent to semitransparent type milky quartz from Madagascar which displays an asterism, or star effect when cut properly.
The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat, was adopted in 1907 at the Fourth General Conference on Weights and Measures, [1] [2] and soon afterwards in many countries around the world.
Blue Nile offers free shipping and returns within 30 days, and they even have a diamond price matching policy to help you get the best possible price. The brand also offers complimentary cleaning ...
Quality opal commands a lower price per carrot than diamond and is magnificent. ... Suggestion to add 'The Royal One' Opal, at 306 carat it's almost double the size ...
Prices for top quality natural red beryl can be as high as $10,000 per carat for faceted stones. ... amethyst, opal, pseudobrookite and hematite. [7] References ...
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