Inclusions of gilalite aggregates in rock crystal from Brazil

Structure in a healing fissure in topaz from Brazil

Two-phase inclusions in sapphire, Sri Lanka

Inclusion of apatite in ruby from Tanzania

Stress fissure («sun spangle») in baltic amber

Dendrites in agate

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Partially etched diamond crystal

Fire opal, Mexico