Inclusion of apatite in ruby from Tanzania

Stress fissure («sun spangle») in baltic amber

Two-Phase inclusions and rutile needles in rock crystal from Brazil

Twin-crystal of chrysoberyl

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

Spinel crystal in dolomite marble, Burma

Inclusions of hematite in feldspar (sunstone), India

Partially etched diamond crystal

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