Two-phase inclusions in sapphire, Sri Lanka

Twin-crystal of chrysoberyl

Inclusions of hematite in aquamarine, Tanzania

Dumortierite in rock crystal, Brazil, polarised light

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

Two-phase inclusion in amethyst, Brazil

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

Colour zoning in ruby from Mong-Shu, Burma

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