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The opal is larger than a brick and is broken into two pieces, which von Brandt said was a practice used decades ago to prove gem quality.

United statesNew south walesBig lakeNick clineAmericus australisFiona altmannJohn altmannRudi chernyAssociated pressAlaska premier auctionsA gemstoneIlled as one of the largest gem quality opals in existenceAs sold for 143750 at auction in alaska on sunday the opalUbbed the americus australisEighs more than 11