Below we have prepared a detailed description of side quest from the Seriphos location in the Pirate Islands archipelago. We have included the exact location of the quest, a walkthrough and a description of rewards you may receive.
This quest starts: After you talk to the little girl.
Description: After talking to the girl, you have to get to two locations (marked in the screenshot above).
In both locations, you have to find glowing stones. In the Lagune, you find Pearls, and inside the cave, these are just the Shiny Stones. They can be found in the wicker baskets. Watch out, as they also hide snakes that can attack you.
For completing this quest, you receive 9300 experience points.