If you have very deep pockets and an affinity for jewellery, circle May 18th on the calendar and start planning a trip to Geneva.

That is when and where Christie’s will auction off the “Oppenheimer Blue”, the largest “fancy vivid blue” diamond ever to be offered at auction.  It is expected to sell for between $35 and $45 million.

The rectangular-cut, 14.62 carat gem is part of the Magnificent Jewels Auction which feature’s more than 280 lots from 19th century pieces to contemporary designs.