Fire opal, Mexico

Inclusion of apatite in ruby from Tanzania

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

Dendrites in agate

Stress fissure («sun spangle») in baltic amber

Agate from Anzi, Maroc

Structure in a healing fissure in topaz from Brazil

Midge included in amber from the Baltic coast, polarised light

Partially etched diamond crystal