Lab Grown Gemstone Suppliers
Stuller is a US metal supplier that also sells traceable diamonds and gemstones. They offer diamonds from Canada, South Africa, Russia, Botswana and Namibia. Stuller also supply lab grown diamonds and gemstones, CanadaMark diamonds and moissanite. You can read more about their sourcing policies here. Stuller also has quite an extensive resource conservation program as part of their Earth First initiative.