Inclusions of hematite in feldspar (sunstone), India

Dendrites in agate

Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Colour zoning in ruby from Mong-Shu, Burma

Bubbles and swirls in moldavite (natural glass)

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

Two-phase inclusions in sapphire, Sri Lanka

Stress fissure («sun spangle») in baltic amber

Spinel crystal in dolomite marble, Burma