The Pink Star

The Pink Star is the most valuable gemstone in history. The Pink Star is the most expensive precious gemstone ever auctioned, with a price tag of more than $71 million. The astronomically priced diamond weighed 59.60 carats, making it the largest internally perfect diamond ever graded by the Gemological Institute of America (GIA).

Sotheby's auction house had a long history of selling valuable jewels, and the Pink Star was no exception. "[There is] extraordinary demand for the finest in colored diamonds," one Sotheby's salesperson said.

De Beers Mining Company mined this extremely valuable gemstone in 1999. Before being cut down to the Pink Star's magnificent 59.60 carats, the original, uncut diamond weighed in at 132.5 carats.

The Pink Star took De Beers two years to cut and polish.

Price: $71.2 million

Year Sold: 2017

Number of Carats: 59.60

Interesting Fact: The largest diamond of its kind graded by the GIA