Nicos Gemstone Dealer is one of the Local's largest diversified mining company. Our portfolio of high-quality mining assets and natural resources spans bulk commodities â Gold ore, Copper, Diamond, Tantalite, precious metals and minerals â in which it is a local company. We sell our products in Africa, Europe, South and North America, Australia and Asia. Key facts: Headquarters: Dar es salaam, Tanzania For more information about Nicos Gemstone Dealer, please contact us direct through +255 655 540 511 or +255 713 736 507