Midge included in amber from the Baltic coast, polarised light

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Two-phase inclusion in amethyst, Brazil

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

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

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

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

Inclusions of hematite in feldspar (sunstone), India

Fire opal, Mexico