Spinel crystal in dolomite marble, Burma

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

Agate from Reichweiler, Germany

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

Partially etched diamond crystal

Midge included in amber from the Baltic coast, polarised light

Natural etching structure on a crystal face of diamond (trigons), polarised light