WEB1-48 of over 1,000 results for "opal gemstone necklace" Results. Price and other details may vary based on product size and color. Overall Pick. Ellena Rose. Sterling Silver Opal Necklace, 925 Sterling Silver, Small Dainty Oval Opal Jewelry for Women, Gemstone Necklaces, Womens Jewelry, Simple Rose Gold Necklaces for Women. 1,047.