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

Fire opal, Mexico

Fluid inclusions in quartz with bituminous daughter minerals, China

Partially etched diamond crystal

Dumortierite in rock crystal, Brazil, polarised light

Agate from Reichweiler, Germany

Bubbles and swirls in moldavite (natural glass)

Stress fissure («sun spangle») in baltic amber

«Red fox agate» from Patagonia, Argentina