«Red fox agate» from Patagonia, Argentina

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

Two-phase inclusions in tourmaline from Namibia

Colour zoning in ruby from Mong-Shu, Burma

Agate from Reichweiler, Germany

Twin-crystal of chrysoberyl

Partially etched diamond crystal

Inclusions of hematite in aquamarine, Tanzania