Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusion of apatite in ruby from Tanzania
Dumortierite in rock crystal, Brazil, polarised light
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Colour zoning in ruby from Mong-Shu, Burma

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