Richard T. Liddicoat

American painter and gem cutter

Belgian mathematician and gemologist

Gemstone cutter, mechanical design engineer and mathematician

British gemologist

American painter, illuminator, and gem cutter

Swiss jeweller, gemologist

American painter, botanist and gemologist

American artist

French artist

Finnish goldsmith, jeweller and gemologist

British gemologist

Norwegian gemologist

US-american photographer, motion picture producer, motion picture director and gemmologist

Australian businessman

Dutch resistance fighter, skipper and gemcutter

American gemologist

Austrian gemmologist

Gemologist Count R.Taaffe of Dublin, Ireland

Head gemologist and director of GRS Gemresearch Swisslab AG