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
Yangtse Incident: The Story of H.M.S. Amethyst Yangtse Incident: The Story of H.M.S. Amethyst Yangtse Incident: The Story of H.M.S. Amethyst (1957) is a British war film that tells the story of the British sloop caught up in the Chinese Civil War and involved in the 1949 Yangtze Incident. It was based upon the book written by Lawrence Earl. The film was known in the US by the alternative titles Battle Hell, "Escape of the Amethyst", "Their Greatest Glory" and "Yangtze Incident". Non-English language titles include the direct German translation of "Yangtse-Zwischenfall", and "Commando sur le Yang-Tse" in France. In Belgium it was known as "Feu sur