Gemfields

Gemfields Group Ltd is a mining company incorporated in Guernsey and headquartered in London. It is the 100% owner of Gemfields Limited, specialising in the mining, grading, and sale of coloured gemstones, particularly emeralds and rubies. The group sells rough, uncut gemstones and does not operate any cutting and polishing facilities. The company is the majority owner and the operator of Kagem Mining in Zambia (emeralds) and Montepuez Ruby Mining in Mozambique (rubies), which industry sources suggest contribute roughly 25% of global emerald supply and 50% of global ruby supply.

Source: Wikipedia · CC BY-SA 4.0