Lewis Hastings Sarett was a research scientist at one of the largest what, in the world?
Merck &amp; Co. Merck & Co., Inc. (), d.b.a. Merck Sharp & Dohme (MSD) outside the United States and Canada, is an American pharmaceutical company and one of the largest pharmaceutical companies in the world.
Gemfields Gemfields plc is an AIM-listed multinational natural resources company headquartered in London, United Kingdom, and is one of the world's leading supplier of responsibly sourced coloured gemstones. The company specializes in the mining, processing and sale of coloured gemstones, in particular emeralds, rubies and amethysts. The group owns the "Kagem" emerald mine in Zambia, the single largest emerald mine in the world, the "Montepuez" ruby deposit in Mozambique, the most significant ruby deposit in the world, and the "Kariba" amethyst mine in Zambia. Gemfields produces around 25% of the world’s emerald supply and 70% of the world's ruby supply.