Twin-crystal of chrysoberyl

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

Inclusions of hematite in aquamarine, Tanzania

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

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

Agate from Reichweiler, Germany

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

Spinel crystal in dolomite marble, Burma

Inclusions of fossil plant debris in opal from Wollo, Ethiopia