Fire opal, Mexico

Stress fissure («sun spangle») in baltic amber

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

Spinel crystal in dolomite marble, Burma

Agate from Reichweiler, Germany

Inclusion of apatite in ruby from Tanzania

Dumortierite in rock crystal, Brazil, polarised light

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

Fluid inclusions in quartz with bituminous daughter minerals, China