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Top 7 Most Expensive Diamonds In the World as of 2021

Curious about what are the most expensive diamonds in the world as of 2021? With their unspeakable beauty and astounding rarity, jewellery that includes diamonds often sells for mind-blowingly large sums of money. For their size and weight, the most expensive diamonds in the world are probably the most valuable items on the planet. The rarest pieces are incredibly hard to come by, and there are even some that are so valuable that their true worth cannot be measured. Here, we answer a question we often hear online, “What’s the Most Expensive Diamonds In the World?”, with a list of the most expensive diamonds ever sold on auction, as of 2021. Let us start our journey…

#7. Pink diamond

Sotheby’s auctioned a ring in Hong Kong that featured a breathtaking 8.41-carat vivid purple-pink diamond, and it sold for $17.7 million. It was mined by De Beers and actually cut meticulously from a much larger 18-carat diamond before being fitted to its platinum ring. It is mounted and pavé-set with a number of circular-cut diamonds. The beautiful colour is just one amazing aspect of this stone. It’s a Type IIa diamond, chemically the purest of these types of gemstones, and its size, hue and colour saturation are also incredibly rare, making it a worthy entry on our list of the most expensive diamonds in the world.

#6. The Winston Blue

This is an extremely valuable platinum ring that features the biggest flawless blue diamond on the planet, and a good nudge in our quest of finding out what is the most expensive diamond in the world. It was auctioned by Christie’s back in May 2014 by Harry Winston and sold for $23.8 million. The piece is 13.22 carats, and it was named after the founder of the company by then-CEO Nayla Heyek. The enormous price of the deal actually far exceeded expectations at the time – a surprisingly common occurrence when a bidding war occurs for such rare items.

#5. Pink Emerald-Cut Graff Diamond

The stone in this elegant ring is graded ‘Fancy Intense Pink’ by America’s Gemological Institute. It is a 24.78 carat emerald-cut stone, and was purchased at auction for $46 million by the esteemed Laurence Graff himself. Graff described it as the “most fabulous” stone he had seen in his illustrious career. The combination of colour and purity is perfectly matched by the emerald cut, which is usually only used with white diamonds. This is just one of the rare features that made this diamon d ring all the more alluring, and one of the most expensive worldwide.

#4. L’Incomparable Necklace

This unbelievably valuable diamond necklace was unveiled by the prestigious Mouawad jewellery company and remains the most valuable and expensive diamond piece in this format anywhere in the world. The central gem was discovered purely by chance by a young girl in the Congo, sat in a pile of the diamond mining by-product kimberlite. It is the largest internally flawless diamond in the world – a startling 407.8 carats – and the necklace features a further 102 smaller stones adorning its elegant design. Its value stands at $55 million.

#3. The Pink Star

Stones of this quality rarely become available for purchase, which contributes to its standing as one of the most expensive diamonds in the world. So, when Sotheby’s put a diamond ring adorned with the impressive 59.60 carat Pink Star diamond, the buyers with the deepest pockets were lining up to buy it. The interest in the diamond was so great that the winning bid of $83 million dwarfed the expected price. Unfortunately, the winning bidder was unable to come up with the money in time, so the piece’s value currently stands at $72 million.

#2. The Peacock Brooch by Graff

There’s no-one more pre-eminent in the diamond world than Graff, the second most expensive diamond in the world at the time of this writing in 2021. To illustrate this enviable status, the London-based company created a staggering Peacock brooch which carries a greater value than a private jet. This piece is adorned with 1,305 gemstones and weighs in at 120.81 carats. The vivid blue diamond at its centre tips the scales at more than 20 carats by itself. The piece’s value is around $100 million, so it really wouldn’t be advisable to head out wearing it in public.

#1. The Hope Diamond

So, what is the most expensive diamond in the world ever sold on auction as of 2021? This is one of the most infamous pieces of jewellery in the history of the world. It has legendary status not only for its incomprehensible beauty but also for allegedly being cursed. It has existed for centuries, with notable owners including people like King Louis XIV and Harry Winston. Winston actually donated it to the Smithsonian Institute in 1958, and it has remained on display there ever since.

The mesmerizing piece, with its 45.52-carat vivid blue diamond, has repeatedly been valued at hundreds of millions of dollars. The Smithsonian, however, claims that due to its rarity, its extremely high profile and its extreme cultural significance, the actual worth of The Hope Diamond is impossible to measure. That makes this remarkable necklace the most valuable piece of diamond jewellery in the world.

The jewellery items in this list are not pieces that you would ever see anyone wearing in public. It is also incredibly rare for any of them to go up for auction. They are one-of-a-kind pieces adorned with diamonds the likes of which have only been discovered a handful of times in history, and their value reflects the remarkable fact that they even exist.

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You can read  more about the type of diamonds we buy or loan against by visiting our loans on fine jewelry page.  Specifically, some of the types of types of diamonds & jewelry you can sell, loan against or pawn at our Beverly Hills pawn shop include: art deco, baguette, Cartier, cushion cut, GIA certified, Graff, Harry Winston, Van Cleef & Arpels,  old cut, oval cut, pear cut, princess cut, round cut, emerald cut, marquise cut,  fancy color, fancy yellow, pink, Tiffany, diamond earrings, engagement & wedding rings, and estate jewelry.