Inclusions of hematite in aquamarine, Tanzania

Agate from Reichweiler, Germany

«Red fox agate» from Patagonia, Argentina

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

Inclusion of apatite in ruby from Tanzania

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Fluid inclusions in quartz with bituminous daughter minerals, China

Bubbles and swirls in moldavite (natural glass)

Colour zoning in ruby from Mong-Shu, Burma