Long graduated antique round amethyst bead necklace with small faceted natural intermediary rock crystal disks and an 18 kt solid gold oblong Slide in clasp with tiny diamonds inserted around circumference Item belonging to my great-great aunt...from the 1930-1940's. Bayonet white and yellow 18 kt gold clasp, (marked 750 on slide-in) with tiny diamonds inserted around middle.. The necklace is : 29 cm long. (Approx. 60 cm measured from one end of clasp to other end). Beads measuring, from largest (center) to smallest: 1.5 cm (15 mm) , 0.6 cm (6 mm). Graduated beads going from: 0.6 cm (smallest, close to clasp) to 1.5 cm central amethyst bead. All natural, genuine amethyst gemstones with alternating light to darker shades.