In the Skaal Village you can find a woman named Morwen - she usually works by the forge. The warrior is in mourning after the loss of her mother - she didn't have time to say goodbye to her. However if someone could take the necklace to the tomb of her mother - Nera - her conscience would be clean. In order to help her, you should head out to the city of Falkret in Skyrim and speak with the Priest Runil. He can be found in the Hall of the Dead or on the streets of the village.
Once you're there, meet with the Elf and give him the necklace. The old priest will put it in the right place and thank you for your favor (on behalf of the dead). You can now return to Morwen.
Return to Morwen in Skaal Village
The woman can be found in the same place that you left her - apparently nothing has changed in the Skaal Village. In return for completing the mission you will not only receive the woman's gratitude, but also part of her equipment. As Morwen was once a very skilled warrior, you shouldn't complain about its quality. Additionally, if you have the Amulet of Mara, you can marry her (both homo and heterosexual).