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
Amethyst Incident Amethyst Incident The "Amethyst" Incident, also known as the Yangtze Incident, was a historic event which involved the Royal Navy ship HMS "Amethyst" on the Yangtze River for three months during the Chinese Civil War in the summer of 1949. On 20 April 1949, HMS "Amethyst", commanded by Lieutenant Commander Bernard Skinner, was on her way from Shanghai to Nanking to replace , which was standing as guard ship for the British Embassy there during the Chinese Civil War between the nationalist Kuomintang led Republic of China and the Communist Party led People's Republic of China. According to the Royal