Natural & Synthetic Mixed Gemstone Disc Pendant Necklaces, with Stainless Steel Chains, Stainless Steel ColorSize: about 17.80 inch(452mm) long, extension chain: 45mm long, pendant: 25x4.5mm.âPlease Note: These Gemstone Include Synthetic Turquoise, Natural Lapis Lazuli, Natural Green Aventurine, Natural Red Aventurine, Natural Lilac Jade, Natural Red Jasper, Natural Tiger Eye.