DRAIN pineapple, reserving juice. Add enough cold water to juice to measure 2 cups; set aside. Stir boiling water into dry gelatin mix in large bowl at least 2 min. until completely dissolved. Stir in pineapple liquid. Refrigerate 1-1/2 hours or until thickened (spoon drawn through leaves definite impression). Gently stir in pineapple chunks and oranges.
SPOON into serving bowl.
REFRIGERATE 4 hours or until firm. Store leftover gelatin in refrigerator.