Twin-crystal of chrysoberyl

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

Spinel crystal in dolomite marble, Burma

Dumortierite in rock crystal, Brazil, polarised light

Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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

Colour zoning in ruby from Mong-Shu, Burma

Inclusions of gilalite aggregates in rock crystal from Brazil