Midge included in amber from the Baltic coast, polarised light
Colour zoning in ruby from Mong-Shu, Burma
Fire opal, Mexico
«Red fox agate» from Patagonia, Argentina
Natural etching structure on a crystal face of diamond (trigons), polarised light
Twin-crystal of chrysoberyl
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Spinel crystal in dolomite marble, Burma

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