Colour zoning in ruby from Mong-Shu, Burma
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Fire opal, Mexico
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 rock crystal and rutile needles in quartz, Brazil, polarised light
Two-phase inclusions in sapphire, Sri Lanka
Bubbles and swirls in moldavite (natural glass)

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