Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Stress fissure («sun spangle») in baltic amber

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

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

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

Twin-crystal of chrysoberyl

Fluid inclusions in quartz with bituminous daughter minerals, China

Two-phase inclusions in sapphire, Sri Lanka

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