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

Partially etched diamond crystal

Agate from Anzi, Maroc

Two-phase inclusion in amethyst, Brazil

Fire opal, Mexico

Dumortierite in rock crystal, Brazil, polarised light

«Red fox agate» from Patagonia, Argentina

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

Stress fissure («sun spangle») in baltic amber