Rose gold-plated sterling silver ring with 15mm square faceted prasiolite surrounded by CZs. The band measures approximately 1.5mm. This ring is available in whole sizes 4-11. .925 sterling silver. ABOUT PRASIOLITE - Also called green amethyst, prasiolite is produced with amethyst quartz is heated, resulting in a beautifully green colored stone. Prasiolite should be protected from extreme heat or strong light for long periods, as it may fade or change the color of the stone.