Dissolve pineapple gelatin in boiling water and stir until completely dissolved.
Add cold water and allow the mixture to cool slightly.
Stir in crushed pineapple and mix well.
Pour the mixture into a serving dish and refrigerate until partially set.
Whip the heavy cream with powdered sugar until light and fluffy.
Spread or spoon the cream over the chilled pineapple Jello.
Refrigerate for another 2–3 hours until fully set, then garnish with pineapple pieces and serve chilled.