a rich purple with a change of colour from reddish-purple under tungsten light to bluish-violet in daylight fetches the highest prices and is known as Siberian. The names Uruguay and Bahia are used for other qualities, both being somewhat paler than the Siberian stones. Some purple pink stones have been called Rose de France (and are imitated by synthetic corundum).Why purple has long been associated with power, wealth, and prestige