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

Fluid inclusions in quartz with bituminous daughter minerals, China

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

Colour zoning in ruby from Mong-Shu, Burma

Two-phase inclusions in sapphire, Sri Lanka

Dumortierite in rock crystal, Brazil, polarised light

Agate from Anzi, Maroc

Stress fissure («sun spangle») in baltic amber

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