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

Spinel crystal in dolomite marble, Burma

Inclusions of hematite in aquamarine, Tanzania

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

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

Two-phase inclusions in tourmaline from Namibia

Fluid inclusions in quartz with bituminous daughter minerals, China

Dumortierite in rock crystal, Brazil, polarised light