#1, this stuff should never be worn as contact jewelry. #2 you will only mark tungsten in any of its forms with a diamond tool. i cant fathom why people would want this crap on their fingers. in some cases it may contain traces of thoriated material.
Thank-You all for your input. I just can't fathom why manufacturers are making jewelery out of this stuff. Titanium was bad enough! IMO Jewelery should be made from Precious metal.