Agate from Reichweiler, Germany

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

Agate from Anzi, Maroc

Inclusions of hematite in aquamarine, Tanzania

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

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

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Stress fissure («sun spangle») in baltic amber

Dumortierite in rock crystal, Brazil, polarised light