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

Bubbles and swirls in moldavite (natural glass)

Two-phase inclusions in sapphire, Sri Lanka

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Inclusions of gilalite aggregates in rock crystal from Brazil

Partially etched diamond crystal

Inclusions of hematite in feldspar (sunstone), India

Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers

Spinel crystal in dolomite marble, Burma