Problems with making signet ring

Hi,

I got asked to re-make a signet ring for a friend of mine. I’ve been trying and trying to remake the ring and I can’t seem to remake it. I’ve tried different ways of making signet rings and i’ve tried to ask questions on here but I just can’t seem to get it. I’m a novice in Rhino and regular shaped (round/square) signet rings are not a problem but I can’t seem to re-make this one. If there is anyone that cares to explain how I can remake this ring please let me know because i’m currently repeatedly running into the same brick wall.

massive thanks,

Ryan

What have you done so far? Where is the problem area?