Acanthite

Imiter, Atlas Mountains, Morocco

Corundum var. Sapphire

Potanino Mine, Ilmen Mountains, Russia

Danburite rough and cut

San Luis Potosi, Mexico

Olmiite on matrix

N Chwanning II Mine, Kuruman, Republic of South Africa

Corundum Var. Sapphire

Balangoda, near Ratnapura, Sabaragamuwa Province, Sri Lanka

Tourmaline Var. Elbaite

Kunar Province, Afganistan