Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Inclusion of apatite in ruby from Tanzania
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Partially etched diamond crystal
Agate from Reichweiler, Germany
Two-phase inclusion in amethyst, Brazil

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