This 17.53-carat amethyst displays a rich reddish purple color. - Lydia Dyer, Super Trillion Cut Amethyst gem courtesy of John Dyer & Co. Amethyst has been the most-prized quartz variety for centuries ...

A purple color in a noblemans escutcheon, or coat of arms. () A variety of crystallized quartz, of a purple or bluish violet color, of different shades. It is much used as a jewelers stone. Amethyst ...