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Most Costly Diamond

By Ashley

July 25, 2025

3 min read

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Most Costly Diamond

Diamonds have long been celebrated for their brilliance, rarity, and enduring value. Among the myriad of diamonds that have captivated the world, the most costly diamond stands out as a symbol of opulence and luxury. These extraordinary gems are not just pieces of jewelry; they are historical artifacts, cultural icons, and investments that transcend generations. This post delves into the fascinating world of the most costly diamonds, exploring their origins, unique characteristics, and the stories that make them legendary.

Table of Contents

The Blue Hope Diamond

The Blue Hope Diamond is one of the most famous and most costly diamonds in the world. Weighing 45.52 carats, this deep blue diamond is renowned for its stunning color and rich history. The diamond's journey began in India, where it was originally mined. It later passed through the hands of various royalty and nobility, including King Louis XIV of France and King George IV of the United Kingdom. The Blue Hope Diamond is currently housed in the Smithsonian National Museum of Natural History in Washington, D.C., where it continues to captivate visitors with its mesmerizing beauty.

The Pink Star Diamond

The Pink Star Diamond is another gem that has made headlines as one of the most costly diamonds. This 59.60-carat pink diamond is celebrated for its exceptional color and clarity. The Pink Star was discovered in South Africa and underwent a meticulous cutting process to enhance its brilliance. In 2017, it was sold at auction for a record-breaking $71.2 million, solidifying its status as one of the most valuable diamonds in the world. The Pink Star's rarity and exquisite beauty make it a prized possession for any collector.

The Oppenheimer Blue Diamond

The Oppenheimer Blue Diamond is a 14.62-carat fancy vivid blue diamond that fetched an astonishing $57.5 million at auction in 2016. Named after the Oppenheimer family, who have a long history in the diamond industry, this gem is renowned for its intense blue color and flawless clarity. The Oppenheimer Blue is a testament to the enduring allure of blue diamonds, which are among the most costly diamonds due to their rarity and desirability.

The Sunrise Ruby

While not a diamond, the Sunrise Ruby is worth mentioning due to its status as one of the most valuable gems ever sold. This 25.59-carat Burmese ruby was sold for $30.4 million in 2015. The Sunrise Ruby is celebrated for its exceptional color, clarity, and size. Its sale highlights the growing interest in colored gemstones, which are increasingly being recognized as valuable investments alongside the most costly diamonds.

The Cullinan Diamond

The Cullinan Diamond is one of the largest rough diamonds ever discovered, weighing an astonishing 3,106.75 carats. Found in South Africa in 1905, the Cullinan Diamond was presented to King Edward VII as a gift from the Transvaal government. The diamond was cut into several smaller stones, the largest of which, the Cullinan I, is set in the British Crown Jewels. The Cullinan Diamond's historical significance and the sheer size of the original stone make it one of the most costly diamonds in the world.

The Koh-i-Noor Diamond

The Koh-i-Noor Diamond is another legendary gem with a rich history. Weighing 105.6 carats, this diamond has been passed down through various dynasties and empires, including the Mughal Empire and the British Royal Family. The Koh-i-Noor is currently part of the British Crown Jewels and is displayed in the Tower of London. Its historical significance and cultural importance make it one of the most costly diamonds in the world.

The Centenary Diamond

The Centenary Diamond is a 273.85-carat pear-shaped diamond that was discovered in South Africa in 1986. This exceptional gem is celebrated for its flawless clarity and exceptional color. The Centenary Diamond was cut and polished by the De Beers company to commemorate their 100th anniversary. Its rarity and beauty make it one of the most costly diamonds in the world, and it is currently on display at the Tower of London.

The Graff Pink Diamond

The Graff Pink Diamond is a 24.78-carat fancy intense pink diamond that was sold for $46.2 million in 2010. This exceptional gem is renowned for its vibrant color and flawless clarity. The Graff Pink was originally owned by Harry Winston and was later acquired by Laurence Graff, a renowned diamond dealer. Its sale price makes it one of the most costly diamonds ever sold at auction.

The Blue Moon Diamond

The Blue Moon Diamond is a 12.03-carat fancy vivid blue diamond that was sold for $48.5 million in 2015. This exceptional gem is celebrated for its intense blue color and flawless clarity. The Blue Moon was discovered in South Africa and underwent a meticulous cutting process to enhance its brilliance. Its sale price makes it one of the most costly diamonds ever sold at auction.

The Orange Diamond

The Orange Diamond is a 14.82-carat fancy vivid orange diamond that was sold for $35.5 million in 2013. This exceptional gem is renowned for its vibrant color and flawless clarity. The Orange Diamond was discovered in South Africa and is one of the largest and most valuable orange diamonds ever discovered. Its rarity and beauty make it one of the most costly diamonds in the world.

The Pink Panther Diamond

The Pink Panther Diamond is a 13.88-carat fancy intense pink diamond that was sold for $39.3 million in 2013. This exceptional gem is celebrated for its vibrant color and flawless clarity. The Pink Panther was discovered in South Africa and is one of the largest and most valuable pink diamonds ever discovered. Its rarity and beauty make it one of the most costly diamonds in the world.

The Red Diamond

The Red Diamond is a 5.11-carat fancy red diamond that was sold for $1.2 million in 2001. This exceptional gem is renowned for its vibrant red color and flawless clarity. The Red Diamond was discovered in Brazil and is one of the largest and most valuable red diamonds ever discovered. Its rarity and beauty make it one of the most costly diamonds in the world.

The Golden Jubilee Diamond

The Golden Jubilee Diamond is a 545.67-carat brown diamond that was discovered in South Africa in 1985. This exceptional gem is celebrated for its size and unique color. The Golden Jubilee was cut and polished by the De Beers company and is currently on display at the Royal Thai Palace in Bangkok. Its historical significance and cultural importance make it one of the most costly diamonds in the world.

The Heart of Eternity Diamond

The Heart of Eternity Diamond is a 27.64-carat fancy vivid blue diamond that was discovered in South Africa. This exceptional gem is renowned for its vibrant blue color and flawless clarity. The Heart of Eternity is part of the De Beers Millennium Jewels collection and is currently on display at the De Beers Diamond Pavilion in London. Its rarity and beauty make it one of the most costly diamonds in the world.

The Millennium Star Diamond

The Millennium Star Diamond is a 203.04-carat flawless, colorless diamond that was discovered in South Africa. This exceptional gem is celebrated for its size, clarity, and color. The Millennium Star is part of the De Beers Millennium Jewels collection and is currently on display at the De Beers Diamond Pavilion in London. Its rarity and beauty make it one of the most costly diamonds in the world.

The De Beers Millennium Star Diamond

The De Beers Millennium Star Diamond is a 777-carat rough diamond that was discovered in South Africa in 1999. This exceptional gem is celebrated for its size and unique shape. The De Beers Millennium Star was cut and polished by the De Beers company and is currently on display at the De Beers Diamond Pavilion in London. Its historical significance and cultural importance make it one of the most costly diamonds in the world.