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

Two-phase inclusions in sapphire, Sri Lanka

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

Agate from Reichweiler, Germany

Two-phase inclusions in tourmaline from Namibia

Partially etched diamond crystal

Two-Phase inclusions and rutile needles in rock crystal from Brazil

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

Fire opal, Mexico