The main prongs on this ruby ring has worn to the extent where a snag caused one of those prongs to peel away and release the oval stone.
As-is, the old prongs can't provide any usefullness. They are removed to make room for replacements.
As each old prong is removed, a healthy new prong is micro-welded into place. Gold is directly fused to gold to provide the strongest bond possible.
In minutes, the ring sports a new set of prongs.
The ruby stone is secured with the stronger prongs. The ring is once again ready to be worn and admired.