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

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

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

Agate from Anzi, Maroc

Two-phase inclusion in amethyst, Brazil

Two-phase inclusions in sapphire, Sri Lanka

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

Structure in a healing fissure in topaz from Brazil

Spinel crystal in dolomite marble, Burma