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

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

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

Bubbles and swirls in moldavite (natural glass)

Inclusions of hematite in aquamarine, Tanzania

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

Inclusions of gilalite aggregates in rock crystal from Brazil

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Dendrites in agate