Ark Angel Alchemy 38ct. Natural Rainbow Moonstone 18" Y Necklace with Extender in Sterling Silver Box The gemstones span 100mm with a hanging length of 32mm at the center of the necklace. Weighing 18 grams.* Necklace is 18" with a 2" extender to vary the necklace length. The total necklace length is 20". The oval moonstones measure 12mm x 8mm and the teardrop moonstone measures 14mm x 10mm.* Handmade, Polished Finish, Excellent Quality, Meticulous Detail.