they would sell them to the pearl buyers who would then sell them to the jewlery shops and others who wanted them
Because all the pearl buyers (at the time of the story) work for the same man, and who ever gives the boss for the lowset price gets payed the most.
Harbor, US spelling. Harbour is British usage. By the way for many years there was a restaurant in Jersey City, on Bergen Avenue, that had the analogous name- Oyster Bay. Pearls are derived from...
I think Juana finds the pearl on the path after kino takes it from and gets into a fight. He drops the pearl, and Juana finds it.
KINO was the one