The latest Diablo 3 patch contains a new item 'Boyarsky's Chip' a gem that fits into a jewellery socket and will not Fall Out.
Leonard Boyarsky was the art director who worked on the original Fallout game - he now works on Diablo 3.
The description for the new gem reads:-
“This fragment of a gem, called a chip, was discovered in an underground vault by old man Boyarsky, who fashioned it into the beautiful gem it is today. It damages those who would damage its owner, once inserted into a socket, it will never fall out.”Below is a screen caption from VG24/7