Beautiful A Grade Amethyst Crystal Ring made in Sterling Silver. Amethyst is the most popular variety of quartz crystals that is considered the most powerful and protective stone. It is a semiprecious violet stone that is often for healing purposes. It has been sought after throughout the ages for its stunning colors and ability to stimulate the mind and emotions. Wonderful! Amethyst relates to the Zodiac Sign of Sagittarius and the colour relates to the Birth month of February. Great gift idea.