Partially etched diamond crystal

Fire opal, Mexico

Spinel crystal in dolomite marble, Burma

Midge included in amber from the Baltic coast, polarised light

Inclusions of hematite in aquamarine, Tanzania

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

Agate from Reichweiler, Germany

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

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan