Dumortierite in rock crystal, Brazil, polarised light

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

Colour zoning in ruby from Mong-Shu, Burma

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

Inclusions of hematite in feldspar (sunstone), India

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

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Structure in a healing fissure in topaz from Brazil

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