Spinel crystal in dolomite marble, Burma

Two-phase inclusions in tourmaline from Namibia

«Red fox agate» from Patagonia, Argentina

Inclusions of hematite in feldspar (sunstone), India

Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Colour zoning in ruby from Mong-Shu, Burma

Natural etching structure on a crystal face of diamond (trigons), polarised light

Dendrites in agate

Inclusions of fossil plant debris in opal from Wollo, Ethiopia