Stress fissure («sun spangle») in baltic amber

«Red fox agate» from Patagonia, Argentina

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Fire opal, Mexico

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

Structure in a healing fissure in topaz from Brazil

Inclusions of gilalite aggregates in rock crystal from Brazil

Fluid inclusions in quartz with bituminous daughter minerals, China

Twin-crystal of chrysoberyl