How to Replace a Stone in a Trifari Pin

Measure the diameter of the empty casting with a brass millimeter gauge. This measurement will give you an estimate of the size of stone you can place in the casting. You can find these measurement gauges at jewelry supply and craft stores.

Bend back the prongs on the open casting with a pair of jewelry pliers. Hold the pin with one hand, bend one prong slightly back and move to the adjacent prong. Bend back this prong and move to the prong next to it. Bend it back and then bend back the adjacent prong.

Scrape off the dried adhesive on the setting with a toothpick. Wipe away any residue with a clean cloth.

Place a small dot of jewelry epoxy on the end of a toothpick. Press the epoxy onto the empty casting on the pin.

Grip the top of the stone, around the flat edge, with the tweezers. Set the stone straight down inside the casting onto the epoxy. Gently press the stone down with the tweezers.

Hold the stone with the ends of two fingers. Bend one prong on the casting back into place over the stone. Move to the adjacent prong and bend it back into place. Continue securing the prongs in this manner until all the prongs are tight around the stone.