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
SS Empire Amethyst SS Empire Amethyst Empire Amethyst was an 8,032 ton tanker which was built in 1941. She was torpedoed and sunk by on 13 April 1942. "Empire Amethyst" was built by the Furness Shipbuilding Co Ltd, Haverton Hill-on-Tees as yard number 330. She was launched on 8 July 1941 and completed in December 1941. "Empire Amethyst" was built for the Ministry of War Transport and operated under the management of the Hadley Shipping Co Ltd, Middlesbrough. "Empire Amethyst" was homeported in Middlesbrough. "Empire Amethyst" was a member of a number of convoys during the Second World War. Convoy ON 17 sailed