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 (1903) the buoys in the outer harbour. "Amethyst"s boats assisted in rescuing the survivors. For much of the autumn of 1915, "Amethyst" stayed in port and acted a temporary depot ship for British submarines passing through on patrol. On 19 November, "Amethyst" headed towards Malta and thence to Gibraltar, arriving on 27 November. On 1 December she set out for Portsmouth, and then on 11 December for Barrow-in-Furness where she moored up in Devonshire Dock. She remained there until 14 March 1916 when she headed south to Plymouth, then Bilbao and arriving in Gibraltar on 23 March. In 1916 Commander Edward