Structure in a healing fissure in topaz from Brazil

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

Twin-crystal of chrysoberyl

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

Inclusion of apatite in ruby from Tanzania

Partially etched diamond crystal

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

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

Two-phase inclusion in amethyst, Brazil