Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Colour zoning in ruby from Mong-Shu, Burma

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

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

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

Inclusion of apatite in ruby from Tanzania

Stress fissure («sun spangle») in baltic amber

Two-phase inclusions in sapphire, Sri Lanka

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