Fluid inclusions in quartz with bituminous daughter minerals, China
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Partially etched diamond crystal
Inclusions of hematite in aquamarine, Tanzania
Twin-crystal of chrysoberyl
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusion of apatite in ruby from Tanzania

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Societé Suisse de Gemmologie
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