Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Structure in a healing fissure in topaz from Brazil

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

Dumortierite in rock crystal, Brazil, polarised light

Bubbles and swirls in moldavite (natural glass)

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Twin-crystal of chrysoberyl

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

Agate from Anzi, Maroc