Partially etched diamond crystal

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

Inclusion of apatite in ruby from Tanzania

«Red fox agate» from Patagonia, Argentina

Agate from Reichweiler, Germany

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

Inclusions of hematite in aquamarine, Tanzania

Dendrites in agate

Colour zoning in ruby from Mong-Shu, Burma