Manolo for the Brides passes along some tips on how to cut through a tungsten carbide wedding band in case of an emergency:
Rings made of extremely hard materials, like tungsten carbide or ceramic, can only be removed by cracking them into pieces with standard vice grip-style locking pliers. Standard ring cutters will not work. Place vice grip-style locking pliers over ring and adjust the jaws to clamp lightly. Release and adjust tightener one-third turn and then clamp again. Repeat until a crack is heard, and then continue clamping in different positions until the hard material breaks away.
From now on, I’m a pair of vice grip-style locking pliers with me to every wedding I attend. Just in case.
(Actually, shouldn’t that be “vise grip”? Hey!)