Colour zoning in ruby from Mong-Shu, Burma

Midge included in amber from the Baltic coast, polarised light

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Fire opal, Mexico

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

Dumortierite in rock crystal, Brazil, polarised light

Two-phase inclusions in sapphire, Sri Lanka

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

Inclusions of hematite in feldspar (sunstone), India