Partially etched diamond crystal

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

Fluid inclusions in quartz with bituminous daughter minerals, China

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

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

Stress fissure («sun spangle») in baltic amber

Two-phase inclusion in amethyst, Brazil

Fire opal, Mexico

Inclusion of apatite in ruby from Tanzania