Amethyst even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine. Amethyst can fade in tone if overexposed to light sources and can be artificially darkened with adequate irradiation. Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglio engraved gems. The largest Ancient Egyptian amethyst mines are located at Wadi el-Hudi and those mines may be the
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