Colour zoning in ruby from Mong-Shu, Burma

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

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

Fluid inclusions in quartz with bituminous daughter minerals, China

Bubbles and swirls in moldavite (natural glass)

«Red fox agate» from Patagonia, Argentina

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

Agate from Anzi, Maroc

Spinel crystal in dolomite marble, Burma