Two-phase inclusions in sapphire, Sri Lanka

Inclusions of hematite in feldspar (sunstone), India

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

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

Inclusion of apatite in ruby from Tanzania

Dendrites in agate

Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil

«Red fox agate» from Patagonia, Argentina