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

Dumortierite in rock crystal, Brazil, polarised light

Stress fissure («sun spangle») in baltic amber

Colour zoning in ruby from Mong-Shu, Burma

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

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

Dendrites in agate

Spinel crystal in dolomite marble, Burma

Inclusions of hematite in aquamarine, Tanzania