Colour zoning in ruby from Mong-Shu, Burma

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

Partially etched diamond crystal

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Midge included in amber from the Baltic coast, polarised light

«Red fox agate» from Patagonia, Argentina

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

Two-phase inclusions in sapphire, Sri Lanka

Twin-crystal of chrysoberyl