1 The iridescent opal, in a mesmerizing rainbow of hues, is October’s birthstone. Equally lovely is Miss Opal™ Barbie® doll, paying tribute to the glorious gem in faux opal jewelry, a sassy lace dress, matching bolero jacket and heels, all in the enchanting pinkish hue. Even the precious puppy’s leash and crown come in the same birthstone shade. How brilliantly beautiful!