There there, dry your tears and get a set of universally accepted ring sizers and a ring stick to match, as advised by Bob (China) above. If in UK, Wheat Sheaf is best, but the cheaper aluminium ring stick will do.
If the client is at some distance, post them a Cookson disposable sizer to confirm the size. If working in an expensive metal, consider making it in brass, or copper first. However wide the shank is, when finished the size mark on the ring stick needs to be in the midline between the edges.
Lastly, skip the maths and follow Andrew Berry in this essential video.
https://www.youtube.com/watch?v=xaU5acww9gc
Dennis
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