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Rare blue diamond fetches $21.5 mn at auction in Geneva

  • The Mediterranean Blue, a 10.3-carat fancy vivid blue diamond, sold at a Sotheby's auction in Geneva late Tuesday for $21.5 million.
  • This rare diamond was recently mined from South Africa's Cullinan mines and first announced in March, generating significant industry excitement.
  • The auction started with an opening bid equivalent to approximately $10.8 million in Swiss francs and featured a heated exchange before the diamond was purchased by an anonymous American private collector.
  • Quig Bruning, Sotheby's head of jewels for North America, Europe, and the Middle East, described the gemstone as the standout piece of the season and emphasized that blue diamonds rank as some of the rarest in the market.
  • The diamond exceeded its $20 million estimate, showing meaningful interest despite broader uncertainties like ongoing US-China trade tensions possibly muting bidding enthusiasm.
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Monaco Life broke the news in Monaco on Wednesday, May 14, 2025.
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