Agate from Anzi, Maroc

Two-phase inclusion in amethyst, Brazil

Spinel crystal in dolomite marble, Burma

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Bubbles and swirls in moldavite (natural glass)

Agate from Reichweiler, Germany

Stress fissure («sun spangle») in baltic amber

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

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