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 and unwounded men who had been sent ashore. He assumed command of the ship that day. During the next few days "Amethyst" moved several times, but each time she got under way the batteries opened fire at her and the ship was forced to anchor, finally finishing up off Fu Te Wei. On 21 April a signal was received: ""HM ships" London "and" Black Swan "are moving up river to escort the" Amethyst "down stream. Be ready to move."" The cruiser and the frigate (ex-sloop and "Amethyst"s sister ship) were heavily shelled as they attempted to help "Amethyst" and retreated