Hi Chris’ Take a piece of broken turquoise, place it on a steel
block, cover it with a cloth, and strike it several times with a
steel hammer. This will give you many small pieces of turquoise.
Select the pieces that come closest to fitting the holes in the
piece of jewelry and push them firmly in. Mix up two-part epoxy
and cover the new “tiles”. When the epoxy is quite hard, polish it
and the new stones down to the level of the surrounding pieces.
Save the leftovers for your next project. Good luck. Tom Arnold