First, glassblowers gather a ball of clear, molten glass on the blowpipe and blow into it a bit. After reheating, a piece of colored glass is dropped onto the bubble and then rolled over the clear. A final layer of clear glass is gathered over the color, creating the unique, three- layered starting point of a .  
  After reheating, the clear-color-clear glass ball is blown out at the glassblower's bench into the unique shape. Then blowers drop the hot glass into a mold and blow it out to give it some height.
Returning to the bench, the blowers transfer the from the blow pipe onto a punty pole and it is reheated. The reheated glass is spun on the punty pole and cut down to the familiar shape.  
  On the annealer oven, the is "bonked," or knocked off the punty pole. Blowers then heat the bottom of the and add the stamp, which marks it as genuine.