Spinel crystal in dolomite marble, Burma

Bubbles and swirls in moldavite (natural glass)

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

Two-phase inclusions in sapphire, Sri Lanka

Inclusions of hematite in aquamarine, Tanzania

Colour zoning in ruby from Mong-Shu, Burma

Structure in a healing fissure in topaz from Brazil

Agate from Anzi, Maroc

Inclusion of apatite in ruby from Tanzania