The round base from which the prongs extend measures 16mm. You will receive twelve oxidized brass settings which are perfect for any stone which measures about 18mm. Made in the USA. You can add jump rings, connectors or chain and then customize the angle of the prongs. First glue the back of the stone to the center of this setting. When the glue has completely dried, gently push the prongs over the stone and any other findings you have used with them. The setting base measures 16mm and the prongs extend 7.5mm from the base. #R607
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