Gem Diamonds Limited operates diamond mines. The company's flagship project is the Leteng mine located in the located in the Maluti Mountains of Lesotho. It is also involved in the production, manufacture, wholesale, retail, and marketing rough and polished diamonds. In addition, the company provides technical, financial, administrative, and management consulting services. It operates in Lesotho, Belgium, British Virgin Islands, Republic of South Africa, the United Kingdom, and Cyprus. The company was incorporated in 2005 and is headquartered in London, the United Kingdom.