Inclusions of hematite in aquamarine, Tanzania

Structure in a healing fissure in topaz from Brazil

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Two-phase inclusion in amethyst, Brazil

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

Stress fissure («sun spangle») in baltic amber

Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil

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

Inclusions of hematite in feldspar (sunstone), India