18k gold Piaget necklace

Beautiful gold necklace Piaget maker Stamped and # B99594 PIAGET 750 on back of pendant with box and case. The necklace may be worn in two different ways as shown in photos. Piaget is known for making movable wearable art to echo their time pieces. This is classic and timeless. Measures 8” like a choker style to pendant and when smaller pendant extends it hangs to 10” Collectors item. Will appreciate.