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 Incident if she came under fire from the shore batteries at Woosung. To achieve this she had moved up the Yangtze during the night, at action stations. Fortunately for the British, "Amethyst" was not spotted by the shore batteries and the two ships then proceeded down river until at 0715 they stood down from action stations and after clearing the river mouth arrived at the Saddle Islands at 1200 hrs to anchor and transfer much needed oil and stores. After a short stay at anchor, "Concord" lent "Amethyst" sailors to fill gaps in her ship's company and the two ships set