Partially etched diamond crystal

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

Agate from Reichweiler, Germany

Inclusions of hematite in feldspar (sunstone), India

Inclusions of gilalite aggregates in rock crystal from Brazil

Twin-crystal of chrysoberyl

Inclusion of apatite in ruby from Tanzania

Stress fissure («sun spangle») in baltic amber

Structure in a healing fissure in topaz from Brazil