Twin-crystal of chrysoberyl

Structure in a healing fissure in topaz from Brazil

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

Two-phase inclusions in tourmaline from Namibia

Inclusions of gilalite aggregates in rock crystal from Brazil

Partially etched diamond crystal

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

Spinel crystal in dolomite marble, Burma

Two-phase inclusion in amethyst, Brazil