Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Partially etched diamond crystal

Colour zoning in ruby from Mong-Shu, Burma

«Red fox agate» from Patagonia, Argentina

Midge included in amber from the Baltic coast, polarised light

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

Bubbles and swirls in moldavite (natural glass)

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