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"Ready" by bluediamond40 on Polyvore featuring WithChic, Sophia Webster, Michael Kors and Alexander Wang

Blue diamond engagement rings: the rarest of them all

Blue diamond engagement rings: the rarest of them all

A unique DavidMorris bluediamond engagementring featuring a rose gold and melée diamond band that separates to meet two pear-shaped white diamonds and one pear-shaped blue diamond.

The extraordinary Cullinan Dream. Largest fancy intense blue diamond (24.18cts) to ever appear at auction. Estimate $23-29 million.

The Blue Moon is the world’s most expensive blue diamond

Sotheby's flawless Blue Moon diamond, a 12.03ct will be the largest ever blue diamond ever to appear at auction. It was cut from a 29.62 rough blue, found by Petra Diamonds at the South African Cullinan mine in Jan 2014. It was purchased by Cora International and took 6 months to cut and polish. Estimates for auction will be between $35 and $55 million.

The most expensive ring in the world

As another impressive blue diamond heads to auction this season, we look at the most expensive ring ever sold - and other worthy contenders.