Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

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

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

Stress fissure («sun spangle») in baltic amber

Structure in a healing fissure in topaz from Brazil

Inclusion of apatite in ruby from Tanzania

Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Dumortierite in rock crystal, Brazil, polarised light