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

Partially etched diamond crystal

Midge included in amber from the Baltic coast, polarised light

Two-phase inclusions in tourmaline from Namibia

Dumortierite in rock crystal, Brazil, polarised light

Inclusion of apatite in ruby from Tanzania

Agate from Reichweiler, Germany

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

«Red fox agate» from Patagonia, Argentina