Mark Robert Summers

MDM Engineering Group Ltd. operates as a mining and metallurgical engineering company. Its services include metallurgical process development, engineering and design, project and construction management, commissioning, and contracting. The company was founded by George Sidney John Bennett and Mike J. Nunn in February 2006 and is headquartered in Johannesburg, South Africa.

Gemfields Ltd. engages in the exploration, mining, processing, and trading of colored gemstones. It operates through the following assets: Kagem, Kariba, Grading system, Auction platforms and Faberge. The company was founded on May 14, 2004 and is headquartered in London, United Kingdom.

The South African Institute of Chartered Accountants is an organization based in South Africa. The South African company's main focus is not explicitly stated in the provided metadata, but it appears to offer online services to its members. Sithembiso Nomvalo has been the CEO of the private company since 2019.

TanzaniteOne Mining Ltd. extracts, produces, and supplies rough tanzanite. It also produce fine cut and polished tanzanite. The firm provides mining, marketing, cutting and polishing services. The company was founded by Michael John Nunn and is headquartered in Arusha, Tanzania.