Multicolor Amethyst Druzy Bookends - Choose your quantity! Uniqueness Guaranteed: Every item is one-of-a-kind, making them ideal for all projects or designs. Avg Size Range: (6.5 to 8 Inches Tall) Sizes Vary Amethyst is a violet gemstone that occurs when quartz containing significant iron impurities and other trace elements undergoes natural geological irradiation over long periods of time, altering the color. Variations in color occur based on the amount of iron and the specific trace elements present in the original quartz. Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.