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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. It is considered to be the rarest diamond in the world.
The most expensive and rarest diamonds are type IIa. The most expensive color grade of a diamond is “D” which is colorless. The highest clarity grade for diamonds is FL or flawless. See our ranking of the most expensive diamonds in the world by price to learn more.
The De Beers Centenary Diamond was cut into a heart-shaped stone with 99 facets, making it one of the rarest and most valuable diamonds in the world. It was displayed to celebrate De Beers' centenary in 1988 and is valued at an estimated $100 million.
Colourless diamonds are the rarest and are the most expensive. The independent non-profit organisation Gemological Institute of America (GIS) and the retail jewellers’ trade association American Gem Society (AGS) are the two foremost authorities on diamond grading and certification.
The shortest answer to the question “What are the rarest diamonds in the world” is “Colored diamonds.” Any color in these gemstones is unusual, as it contradicts the classic vision on diamonds and the most popular engagement ring design with a colorless round solitaire.
Join us as we take a closer look at the most expensive diamonds ever sold, including the top 10 most valuable gems in history. From the Pink Star diamond to the Hope Diamond, we’ll explore the factors that contribute to a diamond’s value and the stories behind these one-of-a-kind gems.
The most expensive diamond rings were of course the rarest diamonds including fancy vivid pink and fancy vivid blue diamond rings in 2023. Below we take a closer look at five of the most expensive diamond rings sold in 2023 at Sotheby's.
The most expensive blue diamond sold by Sotheby's in the last 10 years is the De Beers Blue that sold for $57.5 million in 2022. The De Beers Blue diamond is a step cut 15.10 carat Fancy Vivid Blue, Internally Flawless and a Type IIb diamond.
Most expensive diamond sold at auction. The CTF Pink Star, formerly known as the Steinmetz Pink and the Pink Star, an internally flawless pink 59.6–carat diamond, sold for HKD 553,037,500 ($71.2 m; £57.3 m), including buyer's premium, at a Sotheby’s auction in Hong Kong on 4 April 2017.
The world’s most expensive diamonds have captivated the minds of collectors and investors for centuries. From ancient Indian royalty to modern day billionaires, these rare gems have been sought after as symbols of wealth and prestige.