25 Apr 2013

Rare blue diamond sold at auction

12:49 pm on 25 April 2013

A rare blue diamond sold for $US9.5 million at auction in London on Wednesday, setting a world record for price per carat.

The fancy deep-blue diamond weighing 5.30 carats sold at Bonhams Fine Jewellery sale for a record $US1.8 million per carat, beating the previous record of $US1.68 million.

The diamond is set in a Trombino ring made by Italian jeweller Bulgari around 1965.

It was bought by Graff Diamonds, an international diamond house.

The ABC reports the term "fancy" is used to describe a diamond of intense colour. The blue is derived from small amounts of boron impurities within the diamond.