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
HMS Amethyst (1903) the buoys in the outer harbour. "Amethyst"s boats assisted in rescuing the survivors. For much of the autumn of 1915, "Amethyst" stayed in port and acted a temporary depot ship for British submarines passing through on patrol. On 19 November, "Amethyst" headed towards Malta and thence to Gibraltar, arriving on 27 November. On 1 December she set out for Portsmouth, and then on 11 December for Barrow-in-Furness where she moored up in Devonshire Dock. She remained there until 14 March 1916 when she headed south to Plymouth, then Bilbao and arriving in Gibraltar on 23 March. In 1916 Commander Edward