Two-phase inclusion in amethyst, Brazil

Agate from Reichweiler, Germany

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

Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers

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

Bubbles and swirls in moldavite (natural glass)

Spinel crystal in dolomite marble, Burma

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

Twin-crystal of chrysoberyl