Such an incredibly amazing horn! And it is huge! What are you going to do with it? Are you going to make it into a jewellery piece? Will be interested to see the finished piece.
Very nice piece! As a pendant you can simply wrap sterling silver around the top, like we did with this pendant (it is just paua shell in this example but works with a conical pearl just as fine)
2nd example would give your pearl a nice background for reflection as pendant: