Structure in a healing fissure in topaz from Brazil

Dumortierite in rock crystal, Brazil, polarised light

«Red fox agate» from Patagonia, Argentina

Two-phase inclusion in amethyst, Brazil

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Two-phase inclusions in tourmaline from Namibia

Colour zoning in ruby from Mong-Shu, Burma

Inclusions of hematite in aquamarine, Tanzania

Stress fissure («sun spangle») in baltic amber