Amethyst and it can not be differentiated with absolute certainty without advanced gemmological testing (which is often cost-prohibitive). There is one test based on "Brazil law twinning" (a form of quartz twinning where right and left hand quartz structures are combined in a single crystal) which can be used to identify synthetic amethyst rather easily. It is possible to synthesize twinned amethyst, but this type is not available in large quantities in the market. Single-crystal quartz is very desirable in the industry, particularly for keeping the regular vibrations necessary for quartz movements in watches and clocks, which is where a lot
HMS Amethyst (1799) "Amethyst" captured sundry spars. In November 1808 "Amethyst" captured the French frigate "Thétis" at the Action of 10 November 1808. British casualties in the engagement were severe, with 19 killed and 51 wounded, but French losses were several times larger, with 135 dead and 102 wounded. "Amethyst" had been severely damaged in the engagement and repairs took 71 days to complete at Plymouth. Seymour's victory was rewarded: Seymour himself was presented with a commemorative medal, £100 (with £625 to share among the wounded) and the freedoms of Cork and Limerick. The Admiralty awarded him a gold medal; this was one