You will receive six settings with four prongs and open backs. They are oxidized sterling silver plated brass. The round base from which the prongs extend measures 19mm which is perfect for 20 to 25mm stones. The prongs are about 7mm in length. They are great for odd sized stones because you can use a stone which is larger in them since the prongs can be adjusted. A turtle setting base should be a bit smaller than the stone to prevent it from showing in the finished design. Made in the USA. #R273
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