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Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Partially etched diamond crystal
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Colour zoning in ruby from Mong-Shu, Burma
Two-phase inclusion in amethyst, Brazil
«Red fox agate» from Patagonia, Argentina
Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Reichweiler, Germany
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