Kagem, the emerald mine Gemfields operates in partnership with the Zambian government, has yielded its biggest gem-quality stone yet—a 11,685-carat gemstone dubbed the “Imboo,” or “buffalo,” emerald.

Recovered Aug. 3, the gigantic gemstone is being offered in Gemfields’ latest high-quality emerald auction.

Gemfields did not provide an estimated sale price for the rough emerald, with a company spokesperson noting the miner never provides the value of individual lots offered at auction, only the auction total.

However, Gemfields Managing Director of Product and Sales Adrian Banks speculated in the statement that the Imboo could produce several fine-quality polished emeralds of “significant size.”

In addition to the individual Imboo, Insofu, Inkalamu, and Chipembele emeralds, the Chama pit also produced the “Kafubu Cluster,” a group of emeralds weighing nearly 190,000 carats found in 2022.