what is the name of the largest diamond ever discovered in the united states?

The largest diamond ever discovered in the United States is called the Uncle Sam Diamond.

Quick Scoop

• Name of the diamond: Uncle Sam Diamond.

• Where it was found: Prairie Creek pipe mine, near Murfreesboro, Arkansas (today part of Crater of Diamonds State Park).

• When it was discovered: 1924.

• Original size: About 40.23 carats in rough form.

• Cut size: Later cut to an emerald-shaped stone of about 12.4 carats (often cited as 12.42 carats).

• Current home: Part of the Smithsonian’s National Gem and Mineral Collection in Washington, D.C.

So if you’re asked, “What is the name of the largest diamond ever discovered in the United States?” the clear, one-line answer is:

It’s called the Uncle Sam Diamond.

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Find out the name and story of the largest diamond ever discovered in the United States, the famous Uncle Sam Diamond, including when and where it was found and where it is now.

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