DAVID WILLIAMS wrote to All on Tuesday May 15 2007 at 23:48:

 DW> But suppose the ring had been of tungsten. Nothing less than a
 DW> diamond saw would have cut through it, and I don't usually have one of
 DW> those in the house. Even at a hospital, the ring might have been
 DW> impossible to remove, and I'd have lost the finger.

Tungsten is very hard, but it is also brittle. I once saw a dollar sized
disk being dropped on a concrete floor and it broke, as if it were glass.

You can probably shatter a tungsten ring with a hammer....

Cheers, Michiel

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