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<http://schema.org/description>
"The \"Americus Australis\" gem weighs more than 11,800 carats and is one of the largest gem-quality opals in existence. It also has a long history."
<https://wusfnews.wusf.usf.edu/2022-02-18/alaska-auction-to-feature-brick-sized-opal-that-has-been-stashed-away-for-years>