Partially etched diamond crystal

Midge included in amber from the Baltic coast, polarised light

Agate from Anzi, Maroc

Stress fissure («sun spangle») in baltic amber

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

Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil

Dumortierite in rock crystal, Brazil, polarised light

Two-phase inclusions in sapphire, Sri Lanka

«Red fox agate» from Patagonia, Argentina