Pink diamond worth millions shown in London ahead of auction

A model displays 'The Unique Pink' the largest Fancy Vivid Pink pear shaped diamond ever offered at auction, at Sotheby's auction rooms in London, Thursday, April 7, 2016. The diamond is expected to realise 28-38 million US dollars (19.9-27 million British pounds) (24.6-33.4 million Euros) when is goes for auction in Geneva on May 17. (AP Photo/Kirsty Wigglesworth)

LONDON (AP) — Sotheby’s is displaying the startling “pink star” diamond in London before it’s auctioned in Hong Kong next month.

The company says the gem should fetch more than $60 million when put on the block April 4, which would represent a record for a pink diamond sold at auction.

It said Monday the 59.60-carat gem is the largest flawless fancy pink diamond ever graded by the Gemological Institute of America.

Sotheby’s jewelry division chief David Bennett said that the gem’s size and color “surpassed any known pink diamond recorded in history.” It was mined in Africa in 1999.

The company sold the “blue moon of Josephine” diamond for $48.5 million in Geneva in 2015.