Partially etched diamond crystal

Inclusions of gilalite aggregates in rock crystal from Brazil

Spinel crystal in dolomite marble, Burma

Stress fissure («sun spangle») in baltic amber

Twin-crystal of chrysoberyl

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

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

Agate from Reichweiler, Germany

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan