The Regent Diamond: The Flawless Stone Called the Most Beautiful

Among the crown jewels of France sits a diamond that gemologists have, for three centuries, called one of the most perfect ever cut. The Regent Diamond is not the biggest famous stone, but its clarity is so extraordinary — limpid, almost like a drop of water — that it has been described as the most beautiful diamond in the world. Behind that flawless face is a story of theft, betrayal, royal vanity, and revolution.

A stone smuggled out of a mine

The diamond was found around 1698 in the legendary Golconda mines of southern India — the same source that produced the Hope and the Koh-i-Noor. The most repeated legend says a mine worker hid the giant rough stone inside a self-inflicted wound in his leg to smuggle it out, then was cheated and killed by a sailor who stole it. However it truly left the mine, the rough eventually reached Thomas Pitt, the British governor of Madras, who bought it around 1701. For years it was known simply as the "Pitt Diamond."

Two years under the cutter’s wheel

Pitt sent the rough to London, where cutters spent roughly two years transforming the enormous ~410-carat stone into a 140.64-carat cushion brilliant. It was painstaking, ruinously expensive work — but the result was a diamond of breathtaking transparency and fire, considered a technical triumph of early brilliant cutting.

It is the clarity, not the size, that made the Regent legendary. Experts have long ranked it among the purest large diamonds ever to reach Europe.

From a king’s crown to Napoleon’s sword

In 1717 the stone was sold to the French Regent, Philippe II, Duke of Orléans — and from him it took its lasting name. It was set into the crown Louis XV wore at his coronation, later worn by Marie Antoinette, and eventually mounted in the hilt of Napoleon Bonaparte’s sword. Few gems have decorated so many chapters of French history.

Stolen in the Revolution — and recovered

During the French Revolution, the royal treasury was looted in the 1792 Garde-Meuble robbery and the Regent vanished. It was recovered weeks later, reportedly hidden in a Paris attic. After passing through Napoleon’s hands and beyond, it finally settled where it remains today: the Louvre Museum in Paris, on display among the French Crown Jewels.

Weight

140.64 carats

Origin

Golconda, India (found c. 1698)

Cut from

~410-carat rough, over ~2 years in London

Notable settings

Louis XV’s crown, Napoleon’s sword

Home

The Louvre, Paris

The takeaway

The Regent proves that perfection can outshine sheer size. Cut from a stone smuggled out of an Indian mine and polished into near-flawless clarity, it crowned kings, armed an emperor, survived a revolution, and still draws crowds in the Louvre today — a diamond whose beauty earned it a place at the center of history.