Colour zoning in ruby from Mong-Shu, Burma

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

Bubbles and swirls in moldavite (natural glass)

Dumortierite in rock crystal, Brazil, polarised light

Inclusions of hematite in aquamarine, Tanzania

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

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

Two-phase inclusions in sapphire, Sri Lanka

Spinel crystal in dolomite marble, Burma