Messika unveils necklace featuring Botswana’s largest blue diamond

Messika will unveil a necklace centered on the 20.46-carat Okavango Blue in Paris during Couture Week on July 6, turning Botswana’s largest-ever blue diamond into a high-jewelry spectacle. The piece uses a rivière setting of 500 white diamonds to make the center stone appear to float, a flourish that puts scale and precision at the center of the design.

The Okavango Blue began as a 41.11-carat rough diamond discovered in May 2018 at Botswana’s Orapa Mine. It was later cut into a 20.46-carat oval brilliant and has been described as a Fancy Deep Blue stone with VVS2 clarity, a rare combination even among natural colored diamonds. Its name comes from Botswana’s Okavango Delta, the UNESCO World Heritage site that has become shorthand for the country’s landscape and diamond identity.

The gem is owned by Okavango Diamond Company, a wholly state-owned Botswana enterprise set up in 2012 and put into operation in 2013. That ownership matters: Botswana has used the stone to underline both its diamond heritage and its beneficiation strategy, the push to keep more value and prestige tied to local stones rather than simply exporting rough material. The country’s diamond sector has historically accounted for about 30% of GDP and roughly 80% of export earnings, making any exceptional stone into both a luxury object and a national signal.

Blue diamonds remain among the rarest natural gems because their color comes from boron in the crystal structure. That geology is part of the appeal here, but so is the framing. Messika, the Parisian high-jewelry maison founded in 2005 by Valérie Messika, is presenting the necklace as more than a setting exercise. The 500-diamond rivière gives the Okavango Blue a kind of visual levitation, a deliberate contrast between the single colored stone and the white diamond frame built around it.

The reveal lands at a moment when high-jewelry houses are competing for headline-making natural stones, especially colored diamonds that can still command the kind of attention once reserved for museum objects. With lab-grown diamonds pressuring the broader category, a piece like this functions as a reminder of what the top of the natural-diamond market still trades in: provenance, rarity, and a stone with a story as distinctive as its color.