How does Swarovski make crystal? Do they cut it or pour it into shapes? What is the dif. bet crystal & glass?

It is cut crystal. The main difference between crystal and glass is that lead is infused into the silica glass to make crystal. It must be at least 24% lead to be classified as crystal. 33% is not unusual.

Cut Swarovski Crystal
Cut Swarovski Crystal
Cut Swarovski Crystal