Dumortierite in rock crystal, Brazil, polarised light

Agate from Reichweiler, Germany

Stress fissure («sun spangle») in baltic amber

Bubbles and swirls in moldavite (natural glass)

Fluid inclusions in quartz with bituminous daughter minerals, China

Two-Phase inclusions and rutile needles in rock crystal from Brazil

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

Colour zoning in ruby from Mong-Shu, Burma

Inclusions of gilalite aggregates in rock crystal from Brazil