Amethyst is not primarily defined by carat weight; this is different to most gemstones where the carat weight exponentially increases the value of the stone. The biggest factor in the value of amethyst is the color displayed. The highest grade amethyst (called "Deep Russian") is exceptionally rare and therefore, when one is found, its value is dependent on the demand of collectors. It is, however, still orders of magnitude lower than the highest grade sapphires or rubies (padparadscha sapphire or "pigeon's blood" ruby). Amethyst Amethyst is a violet variety of quartz. The name comes from the Koine Greek ἀμέθυστος "amethystos" from
Amethyst Stakes Amethyst Stakes The Amethyst Stakes is a Group 3 flat horse race in Ireland open to thoroughbreds aged three years or older. It is run over a distance of 1 mile (1,609 metres) at Leopardstown in May. The event was formerly staged at Phoenix Park. For a period it held Listed status. Known previously by sponsored titles, it was renamed the Amethyst Stakes in 1989. It was transferred to Leopardstown in 1991. The Amethyst Stakes was promoted to Group 3 level in 2007. Most successful horse since 1986 (3 wins): Leading jockey since 1986 (6 wins): Leading trainer since 1986