Datolite with Quartz

Dalnegorsk, Primorskij Kraj, Russia

Quartz, var. Herkimer Diamond

Ace of Diamonds Mine, Herkimer County, New York

Heulandite with Stilbite

Jalgon, Maharashtra State, India

Opal (rough and cut)

Shoa Province, Ethiopia

Opal (polished)

Jalisco, Mexico

Corundum Var. Sapphire

Balangoda, near Ratnapura, Sabaragamuwa Province, Sri Lanka