Video. Rare ‘Mellon Blue’ diamond expected to fetch up to $30 million at auction

Editor’s Note

A rare blue diamond, the “Mellon Blue,” will be auctioned with an estimated value of up to $30 million. This preview highlights the gem’s exceptional qualities and its place among the world’s most coveted diamonds.

Auction Preview

A rare blue diamond, known as the “Mellon Blue,” is set to be auctioned with an estimated value of up to $30 million. The gemstone, weighing over 10 carats, is celebrated for its exceptional color saturation and clarity, placing it among the most coveted fancy vivid blue diamonds in the world.

Market Context

The auction comes at a time of strong demand for rare colored diamonds, particularly blues, which have consistently achieved record prices. Industry experts note that stones of this caliber appear on the market only once in a generation.

Expert Commentary

A leading gemologist from the auction house provided insight into the diamond’s significance:

“The ‘Mellon Blue’ represents the pinnacle of nature’s artistry. Its color is both intense and pure, a combination that is extraordinarily rare. We anticipate fierce bidding from international collectors.”

The auction is scheduled for next month and will be conducted both in-person and online.

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⏰ Published on: November 21, 2025