Two-phase inclusions in tourmaline from Namibia

Dendrites in agate

Bubbles and swirls in moldavite (natural glass)

Inclusion of apatite in ruby from Tanzania

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

Spinel crystal in dolomite marble, Burma

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Two-phase inclusions in sapphire, Sri Lanka

Stress fissure («sun spangle») in baltic amber