Spinel crystal in dolomite marble, Burma

Agate from Anzi, Maroc

Twin-crystal of chrysoberyl

Fluid inclusions in quartz with bituminous daughter minerals, China

Two-phase inclusions in sapphire, Sri Lanka

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

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

Structure in a healing fissure in topaz from Brazil

Inclusions of fossil plant debris in opal from Wollo, Ethiopia