Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Reichweiler, Germany
Structure in a healing fissure in topaz from Brazil
«Red fox agate» from Patagonia, Argentina
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Dendrites in agate
Inclusions of hematite in aquamarine, Tanzania

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Societé Suisse de Gemmologie
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