Embed these cups into your fine silver metal clay and set your stone in after firing.
Why use bezel cups? They are fine silver so go with the rest of your metal clay also they can be fired in place.
What if my stone is a little too big to fit? Simply grip you stone between you thumb and middle finger. Gently rub the sides of your stone on 180 to 400 grit (depends on hardness of stone). To test, lay a long piece of thread over bezel put stone in to test. Hold both ends of string and pull up to dislodge the stone from the bezel. Continue to sand to fit.
Alternatively using a 1/2 round you can lightly sand the inside wall of the bezel cup