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 brown dove Amethyst brown dove The amethyst brown dove ("Phapitreron amethystinus") is a species of bird in the family Columbidae. It is endemic to the Philippines. It occurs on most large islands except Palawan but is generally rather scarce on Luzon and Mindanao and even rarer elsewhere. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests. It is found in lowlands but probably prefers middle and high elevations at 500-2000m. It is most often seen singly or in pairs, in and around fruiting trees. The call is a deep, sonorous "hoop" as well as