Bound the halves with copper wire! I always end up with more questions than answers on these things, how was the wire made? I suppose if I'd thought about it, clearly they could do wire for jewellery.

Never ceases to impress me how long ago we were capable of such ornate manufacturing really—most of the time I think progress has been wildly more rapid over the last century or so, and it has in some ways, but in others we're still just doing things we've been doing for millennia.