Two-phase inclusions in sapphire, Sri Lanka
Fire opal, Mexico
Partially etched diamond crystal
Natural etching structure on a crystal face of diamond (trigons), polarised light
Two-phase inclusion in amethyst, Brazil
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
«Red fox agate» from Patagonia, Argentina
Inclusions of gilalite aggregates in rock crystal from Brazil

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