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

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

Stress fissure («sun spangle») in baltic amber

Structure in a healing fissure in topaz from Brazil

«Red fox agate» from Patagonia, Argentina

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

Fluid inclusions in quartz with bituminous daughter minerals, China

Inclusion of apatite in ruby from Tanzania

Fire opal, Mexico