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

Colour zoning in ruby from Mong-Shu, Burma

Fluid inclusions in quartz with bituminous daughter minerals, China

Inclusion of apatite in ruby from Tanzania

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Dumortierite in rock crystal, Brazil, polarised light

Two-phase inclusions in sapphire, Sri Lanka

Two-phase inclusion in amethyst, Brazil

Dendrites in agate