Genuine Rainbow Moonstone .925 Sterling Silver Necklace Pendant comes on a 18” Round Box Chain Pendant is approximately .75” with bail approximately 1” and approximately .50” in width at widest point. See pictures with tape measurer Stone: 5x5 round Rainbow Moonstone, stamped .925 on bail Chain: Thickness: 1 mm Weight per Inch: 0.153 gr Sterling Silver, stamped .925 on spring clasp Chain Made in Italy Some pictures enlarged to show details