Agate from Reichweiler, Germany

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Midge included in amber from the Baltic coast, polarised light

Fluid inclusions in quartz with bituminous daughter minerals, China

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

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Fire opal, Mexico

Agate from Anzi, Maroc

Bubbles and swirls in moldavite (natural glass)