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 woodstar Amethyst woodstar The amethyst woodstar ("Calliphlox amethystina") is a species of hummingbird in the family Trochilidae. It is found in most of central, and eastern South America proper, in Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Suriname-(the Guianas), Paraguay, Peru, and Venezuela. The bird's range surrounds the Amazon countries into the Andes foothills and higher elevations of upstream river systems, but is not along the Amazon River proper in the central Amazon Basin, or the central upper Basin; it is in Brazil at the river's outlet, and upstream for about 500 km. The amethyst woodstar's natural habitats are subtropical