What is a short summary of the story, Semley's Necklace, from the collection, The Wind’s Twelve Quarters?

In the story, Semley's Necklace, Semley is a young noble of the planet Fomalhaut II, as poor in material goods as the noble husband who "loves no gold but the gold of her hair." Semley goes on a quest for the lost treasure of her family, among the Fiia and the Clayfolk and the Starlords. She makes a relativistic journey to the museum planet of the Starlords, a trip that takes her one long night but lasts seventeen years for the planet she returns to at last.