The World Record for the Largest Black Opal in existence!
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Q. Is this the most expensive Opal in Australia? This is the World's largest Australian Black Opal according to the Guinness Book of World Records! Q. Is Black Opal Expensive? Australian Opals are arguably 1000x rarer than Diamond and the worlds #1 rarest commercially available gemstone! so they are valuable...but not expensive! Q. How much...