Spinel crystal in dolomite marble, Burma

Two-phase inclusion in amethyst, Brazil

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

Colour zoning in ruby from Mong-Shu, Burma

Agate from Reichweiler, Germany

Inclusions of hematite in aquamarine, Tanzania

Dumortierite in rock crystal, Brazil, polarised light

Inclusions of hematite in feldspar (sunstone), India

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