Ark Angel Alchemy 29ct. Mystic Crystal 18" Sterling Silver Necklace with 2" Extender Natural Amethyst and Mystic Crystal 18" Necklace, 25 grams in weight.* The gemstones span 110mm in width with a hanging length of 23mm from the center of the necklace.* The mystic crystal stones measure 14mm in length by 10mm in width.* Free Silver Gift Box with Purchase. Necklace is 18" with a 2" extender to vary the necklace length. The total necklace length is 20". Polished Finish, Excellent Quality, Meticulous Detail.