Agate from Anzi, Maroc

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

Fire opal, Mexico

Inclusions of gilalite aggregates in rock crystal from Brazil

Structure in a healing fissure in topaz from Brazil

Agate from Reichweiler, Germany

Dumortierite in rock crystal, Brazil, polarised light

Partially etched diamond crystal

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