Bubbles and swirls in moldavite (natural glass)

Inclusion of apatite in ruby from Tanzania

Stress fissure («sun spangle») in baltic amber

Two-phase inclusions in tourmaline from Namibia

Spinel crystal in dolomite marble, Burma

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

Dumortierite in rock crystal, Brazil, polarised light

Twin-crystal of chrysoberyl

Fluid inclusions in quartz with bituminous daughter minerals, China