The new Crazy Skull watch may be the boldest timepiece yet from de Grisogono, the Swiss brand known for its boundary-pushing designs. A three-dimensional sculpture on the wrist, the watch’s case is shaped like a skull sporting a goofy grin. Depending on the chosen style, the entire surface of the watch is covered with approximately 23 carats of black diamonds, white diamonds, or rubies. The teeth, made up of 7.70 carats of invisible-set baguette-cut white diamonds, open to reveal a tongue set with 66 rubies or…