Danburite rough and cut San Luis Potosi, Mexico |
Diopside Merelani Hills, Lelatema Mtns., Arusha Region, Tanzania |
Olmiite on Calcite N Chwanning II Mine, Kuruman, Republic of South Africa |
Beryl var. Aquamarine (etched) Itatia Mine, Minas Gerais, Brazil |
Corundum Var. Sapphire Balangoda, near Ratnapura, Sabaragamuwa Province, Sri Lanka |
Opal var. Hyalite San Luis Potosi, Mexico |