Pack of four TOUS Cool Color rings in sterling silver comprising: ring with 4.6 mm amethyst bear, ring with 7 mm rose quartz, ring with Ø 6 mm amazonite and ring with Ø 5 mm howlite. Production technique: Casting. A whirlwind of gemstones take center stage to showcase the jewels in the Cool Color collection. Make the sterling silver ring set with amethyst, rose quartz, amazonite and howlite your own and add color to your looks.