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Called the Royal One, the 306-carat, gem-quality black opal was kept hidden for 14 years by a miner who discovered it in the Australian outback. It is almost double the size of the Aurora Australis, found in 1938, which was valued at $1 million in 2005. Pretty Rocks, Beautiful Rocks, Minerals And Gemstones, Rocks And Minerals, Crystal Gems, Stones And Crystals, Gem Stones, Crystal Spikes, Quartz Crystal
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$3 Million Black Opal Goes on Sale in Las Vegas

It's been more than a decade to market for one of the world's most impressive opals, which will be on sale this weekend at an upscale jewelry event in Las Vegas. The minimum ask… 
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The Wall Street Journal
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