20ct. Natural Rainbow Moonstone 18" Necklace with 2" Extender in Sterling Silver The circle castings span 90mm with a hanging length of 43mm at the center of the necklace. Weighing 17 grams.* Necklace is 18" with a 2" extender to vary the necklace length. The total necklace length is 20". The oval moonstone measures 22mm x 16mm.* Free Silver Gift Box. Handmade, Polished Finish, Excellent Quality, Meticulous Detail. Includes a Free, Silver Gift Box.