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Mellon Blue Diamond Sells for 20.5 Million Swiss Francs at Christie’s Geneva

The price sat within the presale range, below the stone’s $32.6 million result in 2014.

The Mellon Blue is a brilliant-cut stone graded as internally flawless
The diamond is a 9.51-carat fancy vivid blue

Overview

  • The 9.51-carat pear-shaped stone is graded Fancy Vivid Blue and Internally Flawless by the Gemological Institute of America.
  • The sale took place at Christie’s Magnificent Jewels auction at the Four Seasons Hotel des Bergues in Geneva, with the CHF 20.5 million total including fees.
  • Compared with its $32.6 million Sotheby’s result in 2014, the outcome represents roughly a 22% nominal decline and a far larger drop in inflation-adjusted terms.
  • Christie’s said the result landed within its $20–$30 million estimate, while reported USD figures differed due to fees and conversion, with ARTnews issuing a price correction.
  • Christie’s leaders highlighted the diamond’s rarity and Bunny Mellon provenance, as Geneva’s jewelry week continues with Sotheby’s offering the 10.08-carat Glowing Rose pink diamond on Wednesday.