No XP is awarded to a victorious combatant if the same sapphire skeleton reconstitutes itself and is defeated one or more times after it initially attacks that combatant.
Sapphire skeletons are like normal skeletons in most respects. However, each has a large valuable sapphire embedded into its forehead. This jewel glows brightly when in combat. If a sapphire skeleton is reduced to zero hit points, it draws itself back together in two rounds and is restored to full hit points. They are immune to fire.
Only the destruction of the jewel embedded in its forehead will destroy sapphire skeletons. The jewel has an armor class of 2 and has 5 hit points. Sapphire skeletons are turned as a 3 hit die undead monster on the undead turning chart. Upon destroying the sapphire, the jewel will break into valuable shards and chunks worth 100gp per skeleton.
Anytime a sapphire skeleton is destroyed via the destruction of its sapphire, there is a 10% chance a regular skeleton will rise from the ground in its place.