Partially etched diamond crystal

Inclusions of hematite in aquamarine, Tanzania

Two-phase inclusions in tourmaline from Namibia

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

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

Structure in a healing fissure in topaz from Brazil

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

Inclusions of hematite in feldspar (sunstone), India

Bubbles and swirls in moldavite (natural glass)