If you have a Bloodstone Amulet in your bags, he will say that it belonged to his son. You may return it to him, if you like, but there is no reward.
Baldur's Gate: Enhanced EditionEdit
He doesn't give you any journal quest record, but if you have Colquetle's Family Amulet, you can return it to him for 250 xp and +1 Reputation. If you ask for a reward or refuse to give him the amulet: -1 Reputation, 250 xp.