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

Stress fissure («sun spangle») in baltic amber

Midge included in amber from the Baltic coast, polarised light

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Spinel crystal in dolomite marble, Burma

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

Partially etched diamond crystal

Two-phase inclusion in amethyst, Brazil

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