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

Natural etching structure on a crystal face of diamond (trigons), polarised light

Fire opal, Mexico

Bubbles and swirls in moldavite (natural glass)

Inclusion of apatite in ruby from Tanzania

Spinel crystal in dolomite marble, Burma

Inclusions of hematite in feldspar (sunstone), India

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

Two-phase inclusion in amethyst, Brazil