Back Necklace Only: Mariell has created this magnificent necklace to accessorize backless or low-backed gowns. Our gorgeous bridal or prom back necklace has shimmering Austrian crystal rhinestone fireballs with a dramatic combo of a smaller fireball and a largeer fireball at the end. Adorn the back. Our neck is adj. 15 1/2″ to 17″ (plus the 7 1/2″ tail).