Dumortierite in rock crystal, Brazil, polarised light

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

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

Structure in a healing fissure in topaz from Brazil

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

Inclusion of apatite in ruby from Tanzania

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

Two-phase inclusions in sapphire, Sri Lanka

Fire opal, Mexico