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

«Red fox agate» from Patagonia, Argentina

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

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Fire opal, Mexico

Partially etched diamond crystal

Inclusions of hematite in aquamarine, Tanzania