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

Colour zoning in ruby from Mong-Shu, Burma

Natural etching structure on a crystal face of diamond (trigons), polarised light

Midge included in amber from the Baltic coast, polarised light

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

Dumortierite in rock crystal, Brazil, polarised light

Two-phase inclusion in amethyst, Brazil

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

Agate from Anzi, Maroc