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

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

Spinel crystal in dolomite marble, Burma

Two-phase inclusions in sapphire, Sri Lanka

Partially etched diamond crystal

Colour zoning in ruby from Mong-Shu, Burma

Dumortierite in rock crystal, Brazil, polarised light

Inclusions of hematite in feldspar (sunstone), India

Fluid inclusions in quartz with bituminous daughter minerals, China