Fire opal, Mexico

Partially etched diamond crystal

Twin-crystal of chrysoberyl

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

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

Two-phase inclusion in amethyst, Brazil

Two-Phase inclusions and rutile needles in rock crystal from Brazil

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

Bubbles and swirls in moldavite (natural glass)