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

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

Twin-crystal of chrysoberyl

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

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

Dendrites in agate

Two-phase inclusions in sapphire, Sri Lanka

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

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