Stress fissure («sun spangle») in baltic amber

Colour zoning in ruby from Mong-Shu, Burma

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

Fluid inclusions in quartz with bituminous daughter minerals, China

Inclusion of apatite in ruby from Tanzania

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Fire opal, Mexico

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

Two-phase inclusions in sapphire, Sri Lanka