Agate from Reichweiler, Germany

Inclusion of apatite in ruby from Tanzania

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

«Red fox agate» from Patagonia, Argentina

Colour zoning in ruby from Mong-Shu, Burma

Natural etching structure on a crystal face of diamond (trigons), polarised light

Spinel crystal in dolomite marble, Burma

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers