most expensive diamond - Decision Point
Thought to be the most expensive diamond in the world, the Koh-I-Noor is also known as The Mountain of Light. Weighing 105.6 carats, this colorless gemstone is now part of the British Crown Jewels.
Thought to be the most expensive diamond in the world, the Koh-I-Noor is also known as The Mountain of Light. Weighing 105.6 carats, this colorless gemstone is now part of the British Crown Jewels.
These aren't just any diamonds. They're 15 most expensive ones ever. Find out what makes them so special and why they're worth fortunes.
From record-breaking auction sales to royal treasures shrouded in mystery, here are the 10 most expensive diamonds in the world as of 2026.
Understanding the Context
If you want to know the most costly diamond in the world or learn about the world record price of a diamond, youve found the right site. On this 2025 list, well look at the most valuable.
Since then, the Pink Star diamond has been owned by luxury jeweler Chow Tai Fook, whose purchase secured the stones place in history. Its the single most expensive diamond or jewel ever sold.
The Princie is one of the worlds best known pink diamonds, and is little surprise that its one of the worlds most expensive diamonds. In 2013, it sold at a Christies auction in New York City for.
The Kohinoor (also spelled Koh-i-noor) is the most expensive diamond in the world, having been given priceless status due to its brilliance and historical significance.
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Key Insights
In this article we reveal our list of the most expensive diamond ever sold. This list was researched and calculated by jewelry veterans Afshin Shaddaie and Benjamin Khordipour. Skip to the.
Mined in South Africa in 1905, the Cullinan diamond, originally weighing 3,106 carats, is the largest rough diamond ever discovered. Named after mine chairman Thomas Cullinan, it has been cut into 105 gems.
The record price paid per carat is $4,028,940 (2,665,890) for Blue Moon of Josephine, a 12.03-carat cushion-shaped internally flawless fancy vivid blue diamond, which sold for US$48,468,158 (CHF.
