Fire opal, Mexico

Colour zoning in ruby from Mong-Shu, Burma

Inclusions of gilalite aggregates in rock crystal from Brazil

Two-phase inclusions in sapphire, Sri Lanka

Fluid inclusions in quartz with bituminous daughter minerals, China

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

Spinel crystal in dolomite marble, Burma

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

Dendrites in agate