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

Fire opal, Mexico

Twin-crystal of chrysoberyl

Colour zoning in ruby from Mong-Shu, Burma

Two-phase inclusions in tourmaline from Namibia

Stress fissure («sun spangle») in baltic amber

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

«Red fox agate» from Patagonia, Argentina