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

Midge included in amber from the Baltic coast, polarised light

Two-phase inclusion in amethyst, Brazil

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

Twin-crystal of chrysoberyl

Structure in a healing fissure in topaz from Brazil

Colour zoning in ruby from Mong-Shu, Burma

Agate from Reichweiler, Germany

Two-phase inclusions in sapphire, Sri Lanka