Inclusions of hematite in aquamarine, Tanzania

Structure in a healing fissure in topaz from Brazil

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

Partially etched diamond crystal

«Red fox agate» from Patagonia, Argentina

Twin-crystal of chrysoberyl

Fire opal, Mexico

Stress fissure («sun spangle») in baltic amber

Two-phase inclusions in tourmaline from Namibia