I believe that cuttng is usually done on heavy lead crystal becuase of it's "softness" and therefore ease of cutting, but that may not always be the case.
What about to the touch, Anne ?
You don't mention it !
Touch is forgotten by many when assessing glass but Terry constantly lectures me about that. Bernard and the other experts here will say the same I'm sure.
Also are there any "rainbow" effect to the "cuts" ?