Bubbles and swirls in moldavite (natural glass)

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

Fire opal, Mexico

Partially etched diamond crystal

Two-phase inclusions in sapphire, Sri Lanka

Two-phase inclusions in tourmaline from Namibia

«Red fox agate» from Patagonia, Argentina

Inclusions of hematite in aquamarine, Tanzania

Stress fissure («sun spangle») in baltic amber