Agate from Reichweiler, Germany

Two-phase inclusions in sapphire, Sri Lanka

Fire opal, Mexico

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Twin-crystal of chrysoberyl

Structure in a healing fissure in topaz from Brazil

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

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