The Largest Cut Diamond in the World

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In 1905, a mine manager in South Africa named Frederick Wells was doing a routine inspection. He spotted something shiny glinting in the wall of the Premier Mine. He thought it was a piece of broken glass. Oops. It turned out to be a crystal the size of a man’s fist—3,106 carats in the rough.

That’s the Cullinan Diamond. It was named after Sir Thomas Cullinan, the mine owner, who probably needed a new pair of pants after hearing the news. Fun fact: the actual stone was so massive that the mine didn’t even have a proper scale to weigh it. They had to estimate it by eye. Imagine doing that at a farmer’s market with a watermelon.

The cutting room: where the real drama happened

Now, imagine you’ve just found the biggest diamond in the world. What do you do? You don’t just pocket it and buy a yacht. You give it to the King of England as a gift, because it’s 1907, and that’s how geopolitics worked. King Edward VII was reportedly thrilled, though I suspect he was also terrified about losing it.

The biggest problem? Cutting the thing. The diamond was sent to Joseph Asscher, the finest cutter in Amsterdam. He studied it for six months. Then, on a specific day, he performed The Cut. He tapped the blade, and the diamond split perfectly—but Asscher promptly fainted dead away from the stress. Honestly, I’d faint too if I had to split a rock worth a whole kingdom.

Largest Cut Diamond In The World

The result was nine major stones and 96 smaller brilliants. The largest of these, the Cullinan I, is the one we’re obsessed with. It’s the biggest top-quality cut diamond ever made. Period. End of debate. Sorry, other diamonds.