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Most valuable diamond to ever be offered at auction

The Pink Star is expected to fetch in excess of £37 million Credit: Sotheby's/PA Wire

The most valuable diamond to ever be offered at auction is expected to fetch in excess of £37 million.

Described as one of "the earth's greatest natural treasures", the Pink Star will go under the hammer at Sotheby's in Geneva, Switzerland, on November 13.

The oval-cut 59.6 carat jewel is the largest flawless or internally flawless, fancy vivid pink diamond that the Gemological Institute of America (GIA) has ever graded.

Glittering diamond could sell for an eye-watering £1.5m

One of the world's rarest diamonds is set to end up with a new and very rich owner later today. The diamond weighs 5.30 carats and is set in a Trombino ring made by renowned Italian jeweller Bulgari.

The rare deep-blue diamond ring
The rare deep-blue diamond ring Credit: PA Wire

It is officially known as a 'fancy' diamond because of its intense colour. Deep-blue is one of the rarest colours the world. The ring was made in the 1960s and could fetch as much as £1.5 million at Bonhams Fine Jewellery sale.

There have only been 30 diamonds of this size and colour that have come up for sale over the last 10 years.

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