Lightly spray pan with vegetable spray.
Place about 1/2 teaspoon prepared gelatin in each diamond indentation.
Cut pineapple slices to fit and place in diamond-shape gelatin area. Let set in refrigerator about 30 minutes.
Carefully add remainder of gelatin to mold and refrigerate overnight.
Unmold and garnish with pineapple top, pineapple slices and maraschino cherries.