My friend has a fab necklace (which she bought from a stall in a Christmas market about 5 years ago, which doesn't help me!) that has a brilliant clasp and I'd really like something similar as it's easy to do up (I struggle with some clasps).
It was a wire sort of choker style necklace (not tight around the throat, but that sort of circular shape) and the two ends fitted together with one end being pointy slotting and sliding (like a willy!) into the other which had a hole and it just carried on going in until the wire (which became increasingly thicker away from the end) stopped it going in any more-so it slid in 3/4 inches maybe.
I've probably described that really badly, but I wonder if anyone know what I mean!?