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
HMT Amethyst 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 Fleetwood. She was sold later