Inclusions of hematite in aquamarine, Tanzania

Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Stress fissure («sun spangle») in baltic amber

Agate from Reichweiler, Germany

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

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Spinel crystal in dolomite marble, Burma

Inclusions of gilalite aggregates in rock crystal from Brazil

Twin-crystal of chrysoberyl