Wikipedia
Gemfields PLC is an AIM-listed multinational natural resources company headquartered in London, United Kingdom, specialising in the mining, processing and sale of coloured gemstones, in particular emeralds and rubies. The group owns the Kagem emerald mine in Zambia, the single largest emerald mine in the world and the Montepuez ruby deposit in Mozambique. Gemfields produces approximately 20% of the world’s emerald supply.
In July 2009, Gemfields commenced a formal auction programme for Zambian emeralds mined at Kagem. To date, the Company has held 15 auctions of rough emerald and beryl produced from Kagem which have generated revenues totalling USD 260 million. The Company has also held two traded emerald auctions (not obtained directly from the Company's own mining operations) which generated revenue of USD 22.0 million.
In June 2014, Gemfields held an inaugural ruby and corundum auction in Singapore from its Mozambique operations. A total of 1.82 million carats were sold which generated total auction revenues of USD 33.5 million;
The company is adamant about the traceability of its stones and has implemented a “mine to market” strategy by which emeralds are “completely traceable from mine to market”.