This would be useful for coin workers who want to avoid sound problems with rings. I'm not married, but I would consider one if I was.
They're quite distinctive colours, so I think you could get some nice colour changing moves.
They may also be flexible, so may fit in a TT or sanada.
Could take a bit of roughly matching coloured rubber, then stick your finger through it - like a karate coin routine - so it becomes a ring.
Could patter about it's purpose (for firefighters etc.) then say how you don't have that reason, and turn it back into a real gold ring.
There's just a few ideas...