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

Inclusions of gilalite aggregates in rock crystal from Brazil

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Fire opal, Mexico

Bubbles and swirls in moldavite (natural glass)

Dumortierite in rock crystal, Brazil, polarised light

Inclusions of hematite in feldspar (sunstone), India

Stress fissure («sun spangle») in baltic amber

«Red fox agate» from Patagonia, Argentina