Stress fissure («sun spangle») in baltic amber

Inclusion of apatite in ruby from Tanzania

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

Structure in a healing fissure in topaz from Brazil

Spinel crystal in dolomite marble, Burma

Fluid inclusions in quartz with bituminous daughter minerals, China

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

Two-phase inclusion in amethyst, Brazil

Agate from Anzi, Maroc