“The Pink Raj”, an intense pink diamond described by experts as the world’s largest, is expected to fetch up to $30 million (£22.57 million) when it is auctioned in Geneva next month.

The stone, which weighs just over 37 carats, was displayed by auction house Sotheby’s in London this week.

“It is a wonderful shape. It is a cushion modified diamond, with a lot of brilliance, a lot of facets, when you move it around and sort of have it on your finger,” Sotheby’s senior jewellery specialist Daniela Mascetti told Reuters.

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The rough diamond was mined in 2015 and is being auctioned by an anonymous owner. Previous sales for smaller pink diamonds have yielded more than $1 million per carat at auction.

A 24.78 carat intense pink diamond sold for more than $46 million - a record price per carat for pink diamonds - in November 2010 in Geneva.