Sterling Silver Garnet Poison Box Locket Ring(Sizes 4,5,6,7,8,9,10) 5x6mm Step-Cut Genuine Garnet Small Hidden Secret Compartment (about 1/4" x 3/8") Weight is Approx. 4 to 4.7 Grams About 3/8" (10mm) Across the Top Marked 925 for Sterling Silver