Here is everything you need:
It can be simple or fancy, I tend to tell my kids to think about wrapping a present.
Loops can be parallel or perpendicular to the gem... it just depends on how you want the jewel to hang on the ribbon. I have come to favor a perpendicular loop, which is the option not shown here. Clip of the long ends of the wire and tuck the ends in so they don't snag on something.
Loop a bit of pretty ribbon to the amulet.
I have pictured my favorite knot here, which has the advantage of being adjustable. Here is an 'ible about tying this knot...
We have made tree ornaments, wands, crowns and ninjago accessories with this method. Have fun!