Stress fissure («sun spangle») in baltic amber

Bubbles and swirls in moldavite (natural glass)

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

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

Two-Phase inclusions and rutile needles in rock crystal from Brazil

Two-phase inclusions in sapphire, Sri Lanka

«Red fox agate» from Patagonia, Argentina

Twin-crystal of chrysoberyl

Colour zoning in ruby from Mong-Shu, Burma