Set as the centerpiece for an upcoming sale by Christie’s, the Cullinan Dream is the largest Fancy Intense Blue diamond offered to be offered on auction (capital letters used there as Fancy Intense Blue is the technical term). It comes with an estimated value of $23 – $29 million and stands as a part of 260 lots (selling alongside jewelry by companies such as Van Cleef & Arpels, Bulgari, and Cartier) offered for the Magnificent Jewels And The Cullinan Dream auction on June 9. This auction is one of many such jewelry sales across all the majors at this time.

The Cullinan Dream is one of four diamonds cut from the 122.52 carat blue diamond that Petra Diamonds discovered in their South African Cullinan mine. It is a cut-cornered rectangular mixed-cut diamond of approximately 24.18 carats mounted on a platinum ring. The gem was rated as Type IIb by the Gemological Institute of America, which attests to its rarity.

“The success of the Oppenheimer Blue speaks to the international demand and market value of these exemplary colored diamonds and with the Cullinan Dream, Christie’s is proud to present another opportunity for collectors to acquire a rare gem being offered for the first time at auction” noted Rahul Kadakia, Christie’s International Head of Jewelry, making reference to an earlier sale made on May 18 in Geneva.

Petra Diamonds themselves have produced some of the most exemplary blue diamonds in the world. As a part of the sale, they’ll receive 15% share of the proceeds, after expenses.

You can check out more information on the sale over at Christie’s website.