Solution

On the right path, follow the seaweed path and don't let the goobue eat all four piles of rocks.

Description

Enshrined upon a pedestal of coral, the jewel flickered faintly. Any who looked upon it became entranced, as if swallowed by that strange light.

The jewel dropped by the sea-maid shone with a mysterious light. The coral pedestal itself was also a sight to behold, colored with hues of white, blue, and pink, as if it housed the entirety of the sea and its creatures. Could it have been a pearl, I wonder? If so, it would have come from a clam of almost impossible size, although perhaps not so impossible in such nutrient-rich waters. I had a chance to examine the jewel and found it flawless. Clearly, even among the wonders of the ocean floor, it was a singular treasure.

Unfortunately, it was not enough. The magnificent jewel failed to move the maiden, bringing an end to our tale. I wonder what the merchant did after that. Did he offer his beloved the jewel even if she had no interest in it? Or did he, as the maiden suggested, sell it for unimaginable riches? Such a treasure would have fetched a fortune in trade. The fact that the maiden was unmoved makes me believe that what she seeks is neither beautiful, precious, nor rare.