Quoted: DO NOT GET TITANIUM RINGS. If you are in a horrible accident or have swelling, no ring cutter will get it off. That means by the time the hospital figures out how to cut the titanium off your finger might be dead and you may need to get an amputation. We had a dude with a titanium ring and it messed up the ring cutter blade pretty bad. Only scratched the ring cutter. I never did find out how they got the damn thing off.
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There are different alloys of titanium, allegedly the "aircraft-grade" rings are the most difficult to cut off with the softer alloys/grades alledgedly being readily cut.
Tungsten Carbide rings are to be broken off using vice grips in an emergency. Clamp the vice grips down and tighten, unlock the vice grips tighten them slightly then squueze down to close them and the rings should crack, open the vice grips, change their position on the rings and close the vice grips again to break the ring in a second spot.
I don't know how many ERs keep vice grips on hand though.