A First Look at the Flawless De Beers 'Jwaneng 28.88' Diamond

De Beers Group, in partnership with Sotheby’s, has unveiled a rare 28.88-carat diamond from Botswana’s Jwaneng mine, on March 19, 2026, ahead of its auction debut at Sotheby’s High Jewellery sale in Hong Kong on 23 April 2026.

Named the “Jwaneng 28.88,” the stone is a round brilliant, D-colour, internally flawless diamond classified as Type IIa — a category representing fewer than 2% of all natural diamonds and recognized for exceptional chemical purity.

The diamond was cut from a 114.83-carat rough recovered at the Jwaneng mine, operated by Debswana, a joint venture between De Beers and the Government of Botswana. The mine is widely regarded as the world’s richest diamond source by value, reinforcing the stone’s provenance credentials.