You will receive six settings with prongs. They are known as turtle settings. These hold flat back stones which measure about 18mm. These settings are oxidized sterling silver plated brass and the round part from which the prongs extend measures 16mm. They are perfect for odd sized stones and antique typewriter keys because you can use a stone which is 5mm larger or smaller with these settings. A turtle setting base should be a tiny bit smaller than the stone to prevent it from showing in the finished design. #A807
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