Two-phase inclusion in amethyst, Brazil

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

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Inclusion of apatite in ruby from Tanzania

Stress fissure («sun spangle») in baltic amber

Colour zoning in ruby from Mong-Shu, Burma

Midge included in amber from the Baltic coast, polarised light

Dendrites in agate

Agate from Reichweiler, Germany