"It's a long story." Kili sighed as he looked at the halfling. "From what I know, there was something that happened between them. A broken agreement or something, before I was born. Thorin says that the Elves asked them to do some work with metal and jewels for them, but when the work was done, the Elves refused to pay my kin rightly for the work they had done, so my kin kept the gems." the young dwarf shrugged slightly. "The Elves tell another story."