Inclusions of hematite in feldspar (sunstone), India

Partially etched diamond crystal

«Red fox agate» from Patagonia, Argentina

Spinel crystal in dolomite marble, Burma

Inclusions of hematite in aquamarine, Tanzania

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

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

Dendrites in agate