Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

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

Inclusions of gilalite aggregates in rock crystal from Brazil

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

Inclusion of apatite in ruby from Tanzania

Two-Phase inclusions and rutile needles in rock crystal from Brazil

Inclusions of hematite in aquamarine, Tanzania

Two-phase inclusions in sapphire, Sri Lanka