Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Inclusions of hematite in aquamarine, Tanzania
Inclusions of gilalite aggregates in rock crystal from Brazil
Natural etching structure on a crystal face of diamond (trigons), polarised light
Structure in a healing fissure in topaz from Brazil
Bubbles and swirls in moldavite (natural glass)
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

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Schweizerische Gemmologische Gesellschaft
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