Ark Angel Alchemy 10ct Sterling Silver Natural Celtic Rainbow Moonstone 18" Necklace with 2" Extender Rainbow Moonstone Celtic necklace is over 10.5 grams of .925 Sterling Silver. Necklace has an extender to vary the necklace lengths. The Necklace width is 54mm with a center drop of 20mm in Length.* The oval stone measures 15mm in Length by 11mm in Width.* 18 Sterling Silver Chain with 2 Extender to vary the necklace length. Total Necklace Length is 20. Handmade, Polished Finish, Excellent Quality, Meticulous Detail. Includes a free silver gift box.