Stress fissure («sun spangle») in baltic amber

Dumortierite in rock crystal, Brazil, polarised light

Two-phase inclusion in amethyst, Brazil

Agate from Reichweiler, Germany

Structure in a healing fissure in topaz from Brazil

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

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

«Red fox agate» from Patagonia, Argentina

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