Ella May and the Wishing Stone — Cary Fagan

When Ella May finds a smooth stone with a line going all-all-all the way around it, she is convinced it has magical powers. Surely such a stone will grant wishes, she thinks. But when her friends want to join in the fun, Ella May says that the stone is too special. Slowly she comes to realize that keeping the stone all to herself is a sure way to lose friends. By using her imagination, Ella May finds a way to make everyone's wishes come true-including her own.