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

Twin-crystal of chrysoberyl

Structure in a healing fissure in topaz from Brazil

Inclusions of gilalite aggregates in rock crystal from Brazil

Inclusions of hematite in feldspar (sunstone), India

Two-phase inclusions in sapphire, Sri Lanka

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

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

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