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
HMS Amethyst (1799) kept "Amethyst" from joining the action. The British brought "Dédaigneuse" into Royal Navy service as HMS "Dedaigneuse". Later on 28 January "Sirius" and "Amethyst" captured the Spanish Letter of Marque "Charlotta" (or "Carlotta") of Ferol, 16 hours out of Ferol on her way to Curaçao. The capture took place about six or seven leagues from Cape Belem in Galicia. The hired armed cutter "Earl St Vincent" shared in the capture. The next day captured the Spanish privateer "Intrepido Cid". "Amethyst" and "Sirius" shared in the prize money by agreement. On 16 March, "Amethyst" encountered and captured "Nostra Signora del Carmen",