How did the pearl buyers try to deceive and cheat Kino? What was Kino's response

The pearl dealer, and his cohorts, who symbolizes the ruling elite classes, prove to be another example of a manipulative professional man akin to the priest and the doctor. He shamelessly attempts to cheat Kino out of his money, offering a price that seems far too low for such a pearl; although there remains the possibility that the pearl may be an oddity with little practical value, the numerous attempts to steal the pearl, perhaps instigated by the pearl dealers, suggest otherwise. Kino's refusal is no small feat; as Juan Tomas declares, he has defied the structure of life around him.