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

Fire opal, Mexico

Natural etching structure on a crystal face of diamond (trigons), polarised light

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

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

Inclusion of apatite in ruby from Tanzania

Fluid inclusions in quartz with bituminous daughter minerals, China

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

Stress fissure («sun spangle») in baltic amber