Gemfields is a world-leading miner and marketer of colored gemstones, specializing in rough emeralds from Zambia and rubies from Mozambique. The company operates the Kagem emerald mine (one of the world's largest producing emerald mines) and the Montepuez Ruby Mining operation, together supplying approximately one-quarter of global emerald supply and 50% of global ruby supply through private auctions to gemstone dealers, cutters, jewelry manufacturers, and luxury brands.