Carat

The gemstone's only competition for sheer size is the Cullinan, a 3,106-carat diamond uncovered in 1905

The largest diamond found in more than a century has been unearthed in Botswana. The 2,492-carat diamond is the second-biggest ever found in a mine, the government said.

Researchers suggest that the famed Golconda diamonds, including the Hope Diamond and Koh-i-noor, may have originated from a volcanic outcrop nearly 200 miles from where they were mined.

Here's everything you need to know about diamonds synthesized in the lab, and how they may (or may not) differ from their natural counterparts.

A diamond is a solid rock of carbon and the hardest known naturally occurring substance. Because diamonds also have some extraordinary optical and physical properties, intensive research is underway on their use in laser and quantum technology.

A ruby sold at Sotheby's in New York on Thursday for $34.8 million, setting a new record price at auction for the precious stone.The 55.22-carat gemstone named Estrela de Fura was already the largest ruby ever to go under the hammer.It was cut from a 101-carat rough stone discovered in July last yea...

Sotheby's will be auctioning off the most valuable purplish pink diamond ever brought to auction in Hong Kong this June.

The crater, near Murfreesboro, is the only currently active diamond mine in the country. It's also the only one anywhere that invites visitors to come, and for a modest fee,

A pear-shaped 18-carat pink diamond billed as a rarity sold at a Geneva auction for 28.4 million Swiss francs ($28.8 million) including fees and taxes, on the lower end of the expected range

GENEVA — A pear-shaped 18-carat pink diamond billed as a rarity sold at a Geneva auction for $28.8 million, including fees and taxes, on the lower end of the expected range. The "Fortune Pink" fancy vivid pink stone, said to be the largest of its kind and shape to go

The Fortune Pink diamond, an exceptionally rare giant gemstone, sold for more than $28.5 million at auction in Geneva on Tuesday to a private Asian collector.At 18.18 carats, the gem is the largest pear-shaped "fancy vivid pink" diamond ever sold under the hammer, Christie's auction house said.The ...

Calls are growing in South Africa for Britain's royal family to return the world's largest known clear-cut diamond in the wake of Queen Elizabeth II's death.

A rare pink diamond, weighing 170 carats and called "The Lulo Rose," has been unearthed in Angola and is believed to be one of the largest ones discovered in the last 300 years.

Britney Spears' sons with ex-husband Kevin Federline, Sean Preston and Jayden James, will not be in attendance at her wedding to Sam Asghari.

Named "The De Beers Cullinan Blue," the massive 15.10-carat step-cut gem sold at Sotheby's in Hong Kong after an eight-minute bidding war.

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Statement Necklaces Remain a Popular Trend on the Red Carpet

An increasing number of soon-to-be brides are showing off substitute gemstones like moissanite and morganite. Here's why.

The Cullinan III and IV Brooch displayed during the Queen's Diamond Jubilee exhibition at Buckingham Palace (Peter Macdiarmid/Getty Images) "Cutting King's Diamond" (originally appeared in the Los Angeles Times, 26 April 1908) The special correspondent

Learn everything you need to know about the four Cs: color, cut, clarity and carat