Rare blue diamond set to fetch sky-high price

The 'Sky Blue Diamond'/Sotheby's
The 'Sky Blue Diamond'/Sotheby's

Auction house Sotheby's is selling off a stunning blue diamond - for a sky-high price.

The 8.01 carat 'Sky Blue Diamond' is expected to be sold for US$15 and US$25 million, when it goes up for auction in Geneva on November 16.

This diamond is no ordinary gem. It has been categorised as a Fancy Vivid Blue diamond by the Gemological Institute of America, as well as being labelled a Type IIb. In other words, it's extremely rare and valuable.

And this isn't the only pricy blue diamond Sotheby's has sold recently.

In 2015 they sold 'The Blue Moon' - a 12.03 carat rock - for US$48.5 million.

Rare blue diamond set to fetch sky-high price

'The Blue Moon'/Sotheby's

In addition, there was 'The Zoe Diamond', which reached US$32.6 million in 2014.

Rare blue diamond set to fetch sky-high price

'The Zoe Diamond'/Sotheby's

While earlier this year, the 'Millennium Blue' sold for US$31.8 million.

Rare blue diamond set to fetch sky-high price

'Millennium Blue'/Sotheby's

Newshub.