Inclusions of hematite in aquamarine, Tanzania

Two-phase inclusion in amethyst, Brazil

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

Inclusions of gilalite aggregates in rock crystal from Brazil

Dumortierite in rock crystal, Brazil, polarised light

Colour zoning in ruby from Mong-Shu, Burma

Two-Phase inclusions and rutile needles in rock crystal from Brazil

Bubbles and swirls in moldavite (natural glass)

Agate from Anzi, Maroc