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
HMT Amethyst from a sunken German craft. HMT Amethyst HMT "Amethyst" was a naval trawler requisitioned by the Admiralty prior to the Second World War. She was sunk in the second year of the war. "Amethyst" was built as the commercial trawler "Phyllis Rosalie" by Smiths Dock Company, South Bank-on-Tees and was launched on 15 January 1934. Her first owners were the Boston Deep Sea Fishing & Ice Co Ltd, based at Fleetwood. In 1935 she set a number of records for catches landed at Fleetwood, and was present at HM King George V's Silver Jubilee Spithead Review, representing the port of