Final answer:
In John Steinbeck's 'The Pearl', Kino's sole valuable possession is a large and valuable pearl, which he hopes will bring a better future for his family.
Step-by-step explanation:
The question pertains to John Steinbeck's novella The Pearl, where the character Kino's sole valuable possession is a magnificent pearl. This pearl symbolizes hope and the possibility of a better future for Kino and his family. Despite the many troubles the pearl brings, it is seen as Kino's ticket to a life free from oppression and poverty. The importance of the pearl is heightened given that Kino is a poor pearl diver, and this find could change his life dramatically. The discovery of the pearl sets off a chain of events that drives the plot of the story, illustrating themes of greed, wealth, and social inequality.