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Hillsboro Museum home to Guinness World Record-winning tanzanite gem
On Saturday, March 9, the Rice Northwest Museum of Rocks and Minerals witnessed history marked by L’Heure Bleu — a gem verified as the largest cut tanzanite in the world. Weighing an ...
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Rare gem discovered in Colorado mine up for auction, bidding starts at $8,000
It falls behind only a beryl var aquamarine from Brazil, starting at $10,000; a tanzanite from Tanzania ... and put on display at the Denver Museum of Nature and Science, auction officials ...