This is the name given to the somewhat rare variety of transparent orthoclase which is basically yellow in color and usable as a gem.
Appearance The color varies from mid- to golden yellow. It is perfectly transparent with vitreous luster. The cut most commonly used with this gem is the step cut. Gems are usually free of inclusions.
Distinctive features Noble orthoclase principally resembles softly colored citrine and beryl, which can only be distinguished from it by their physical properties.
Occurrence It comes mainly from Madagascar, where it is found in pegmatites.
Value Low, even compared with other secondary gems. Being somewhat rare. however. fine specimens are sought by collectors and connoisseurs.
Simulanta and synthetics It is neither imitated nor produced synthetically.