The World's 5 Most Famous Diamonds: Hope, Cullinan, Koh-i-Noor, Tiffany & Pink Star

For centuries, certain diamonds have crowned kings, survived revolutions, and captivated the world. These are not merely gemstones—they are history crystallized into light. In this guide, we explore five of the world's most famous diamonds and the legends behind them. More than any textbook, these storied stones reveal the one quality that defines a diamond above all others: a beauty that endures, unchanged, across time.

1. The Hope Diamond — A Deep Blue Wrapped in Legend

Now housed at the Smithsonian's National Museum of Natural History in Washington, D.C., the Hope Diamond is a 45.52-carat blue diamond of extraordinary depth. Mined in India in the 17th century, the original rough exceeded 112 carats and once belonged to King Louis XIV of France, who knew it as the "French Blue." It vanished during the chaos of the French Revolution and was later recut to its present size. Famous for a supposed "curse" said to befall its owners, its serene, otherworldly blue continues to draw crowds from around the globe.

2. The Cullinan — The Largest Rough and the "Star of Africa"

Discovered in 1905 at the Premier Mine in South Africa, the Cullinan remains the largest gem-quality rough diamond ever found, at an astonishing 3,106 carats. The famed Asscher firm of Amsterdam cleaved it into nine major stones and roughly one hundred smaller ones. The largest, Cullinan I—the "Great Star of Africa"—weighs 530.4 carats and is set in the Sovereign's Sceptre, making it the largest cut colorless diamond in existence. Cullinan II, at 317.4 carats, adorns the Imperial State Crown. Both are kept among the Crown Jewels in the Tower of London.

3. The Koh-i-Noor — A Story Written in Crowns

Its name means "Mountain of Light," and the Koh-i-Noor is a diamond of roughly 105 carats. Mined in India, it passed through the hands of empire after empire before reaching the British royal family in the 19th century. Traditionally set into the crowns of queens consort, its contested history remains a subject of debate today. At the 2023 coronation, the decision was made not to feature the stone—a quiet reminder that the gems adorning a crown can take on new meaning with the times.

4. The Tiffany Diamond — 128.54 Carats of Golden Fire

Unearthed in 1877 in the Kimberley mines of South Africa, this Fancy Yellow diamond was acquired by founder Charles Lewis Tiffany and cut into an exceptional 82-facet cushion by the house's chief gemologist. Only a handful of women in history have ever worn it: Audrey Hepburn during publicity for Breakfast at Tiffany's in 1961, and Lady Gaga at the 2019 Academy Awards, where its golden light became part of cinematic legend once more.

5. The Pink Star — The Most Valuable Gem Ever Auctioned

A 59.60-carat Fancy Vivid Pink of Internally Flawless clarity, the Pink Star is a near-miracle of nature. In 2017, it sold at auction in Hong Kong for approximately US$71.2 million—the highest price ever paid for any gemstone, a record that still stands in 2026. It represents the extraordinary rarity of pink diamonds united with cutting brought to the very limits of perfection: a modern legend.

What These Legendary Stones Teach Us — and the ADAMAS Philosophy

What unites these historic diamonds is a single truth: across generations, they lose neither their value nor their brilliance. Standing at the very summit of the colorless scale, the "D color" grade reflects a diamond's purest, most uncompromising light. At ADAMAS, we bring that same timeless beauty into everyday life through refined jewelry crafted from K18 gold and D-color diamonds—so that, like the great stones of the museums, your brilliance can be passed from one generation to the next.

Wear a Brilliance That Outlasts Time

The legendary diamonds of the crown may be beyond reach, but the eternal light at their heart is something you can truly wear. Discover diamond jewelry made to be loved across a lifetime at the ADAMAS official site.