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

Two-phase inclusions in sapphire, Sri Lanka

Fire opal, Mexico

Spinel crystal in dolomite marble, Burma

Inclusion of apatite in ruby from Tanzania

Two-phase inclusion in amethyst, Brazil

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

Midge included in amber from the Baltic coast, polarised light

Two-phase inclusions in tourmaline from Namibia