1 pkg. black raspberry sugar-free gelatin
1 pkg. strawberry sugar-free gelatin
4 1/2 c. boiling water
8 packets NutraSweet
2 c. water
1 c. lemon juice
1 (46 oz.) pineapple juice, unsweetened
1 (2 liter) diet 7-Up

Dissolve gelatins in boiling water; cool to warm. Add NutraSweet, water, lemon juice, and pineapple juice. Freeze. Thaw 2 1/2 to 3 hours before serving. Pour 7-Up over fruit mixture. Serve.