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

Colour zoning in ruby from Mong-Shu, Burma

Two-phase inclusion in amethyst, Brazil

Twin-crystal of chrysoberyl

Inclusion of apatite in ruby from Tanzania

«Red fox agate» from Patagonia, Argentina

Dendrites in agate

Agate from Anzi, Maroc

Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil