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

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

Colour zoning in ruby from Mong-Shu, Burma

«Red fox agate» from Patagonia, Argentina

Inclusions of gilalite aggregates in rock crystal from Brazil

Inclusions of hematite in aquamarine, Tanzania

Bubbles and swirls in moldavite (natural glass)

Midge included in amber from the Baltic coast, polarised light