Rio Oso Gem a late variety, large round freestone with unusually well colored skin, yellow fleshed, medium texture, firm excellent quality, and ships well.  Popular due to its size, firmness, attractiveness, and time of ripening.  It is considered among the better varieties.  Originated in Rio Oso, California, by W.F. Yerkes.  Ripens 1 week after Elberta.