Blue diamond and bling Barbie for sale at Christie's

A two-stone fancy vivid blue and colourless diamond ring, designed by the house of Bulgari, is set to go under the hammer at Christie's in New York.

The 1970s era Bulgari ring is expected to fetch more than US $15m and is one of more than 450 lots that will feature in a showcase jewellery auction.

Another highlight of the sale will be a custom-made Barbie doll by designer Stefano Canturi.

Rahul Kadakia, head of Jewellery at Christie's, said that there was interest in the items up for auction from all over the world.