Vintage White Opal Silver Color Necklace & Tack Pin. Selling to organize my closet. White opal is characterized by its milky white appearance and mysterious beauty due to its glossy texture. Iridescent colors (play-of-color effect) appear depending on the viewing angle. This is a necklace and tack pin using white opal with a cabochon cut. The necklace is in beautiful condition with no major damage, but the tack pin has rust on the metal parts. Please understand that these items are pre-owned and have been stored at home. Immediate purchase is welcome. If you have any other questions, please feel free to comment.