Black coral can be drilled. Thus the wires can be posted and glued
in place. Solder two posts to each of your wires. Used the wires to
mark the placement of the wire in the grooves of the coral “stone” in
the setting. Using water to keep it cool, and drill two small holes
inside each line that are the same diameter as your posts. Use a good
epoxy and be sure to get some into the post holes. Finally, if you
are truely a fanatic, bend the posts that protrude through the
underside of the coral. They will never come out.