The opal's iridescent luster makes it a fabulous gemstone for jewelry. Different colors appear in the opal, giving it a kaleidoscope effect. The gemstone is October's birthstone, but makes a beautiful gift for any occasion. An opal necklace is a fabulous way to wear an opal as it draws the eye to the wearer. Ross-Simons has a collection of opal necklaces, including a white opal pendant in 14kt yellow gold that's simple but extraordinary. We also have vintage opal necklaces in our Estate Collection, which are one-of-a-kind treasures.