Blue diamonds

As autumn auction season approaches, we hunt out the most expensive ring on the planet and other worthy contenders. 

The 24.18 carat Cullinan Dream is the largest and most expensive Fancy Intense blue diamond to ever go under the hammer.

This 14.62ct Vivid Blue diamond has become one of the most expensive diamonds ever sold at auction.     

As three historic blue diamonds vie for a place in the jewellery auction record books, Åse Anderson takes a closer look.

The lead lot at Sotheby’s New York auction on 19 April will be the legendary star’s beloved blue diamond ring.

The De Beers Millennium Jewel 4, the largest oval Fancy Vivid blue diamond, will go under the hammer at Sotheby's Hong Kong in April.

Fetching sky-high prices at auction this year proves that diamonds are still the most coveted gems in the world. 

Blue diamonds are incredibly scarce, and increasingly desirable. Rachael Taylor takes a closer look at one of the rarest gemstones in the world.

Natural blue diamonds are extremely rare and command prices to match, placing blue diamond engagement rings at the very pinnacle of luxury.