Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Agate from Anzi, Maroc

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

Stress fissure («sun spangle») in baltic amber

Two-phase inclusions in sapphire, Sri Lanka

Dumortierite in rock crystal, Brazil, polarised light

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

Spinel crystal in dolomite marble, Burma

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