The Uses of Amethyst. Amethyst is a gemstone that is crystallized quartz. Amethyst is known throughout the world for its beauty. This crystalline gemstone usually comes in beautiful colors such as violet and purple.It is also important to note that Citrine is created from heat treated Amethyst, Citrine’s color is yellow orange.methyst is a type of quartz and is perfect for ornamental jewelry. Amethyst has been known to man for millennia and was popular with the Ancient Greeks, as well as the Ancient Egyptians. Amethyst has a wonderful history.