Two-phase inclusions in sapphire, Sri Lanka

Fire opal, Mexico

Dumortierite in rock crystal, Brazil, polarised light

Inclusion of apatite in ruby from Tanzania

Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers

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

Fluid inclusions in quartz with bituminous daughter minerals, China

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Spinel crystal in dolomite marble, Burma