1In medium bowl, place raspberry gelatin. Pour boiling water over gelatin and stir until dissolved. Add cold water; stir until well combined. Cool slightly. Place 4 raspberries in each of 4 champagne glasses; fill each glass about one-third full with raspberry gelatin. Refrigerate until set, about 1 hour.
2In small saucepan, heat whipping cream, white chocolate and 3 tablespoons sugar over medium heat until chocolate is melted. Remove from heat; cool. In small bowl, sprinkle 2 teaspoons unflavored gelatin over milk; stir until gelatin is dissolved. Pour milk mixture over cooled white chocolate mixture; stir until blended. Pour over raspberry layer in each glass. Refrigerate until set, about 30 minutes.
3In small saucepan, heat 1 cup of the champagne and 3 tablespoons sugar to boiling. Remove from heat; cool. In small bowl, sprinkle 1 envelope unflavored gelatin over remaining 1 cup champagne; stir until gelatin is dissolved. Pour gelatin mixture over cooled champagne mixture; stir until blended. Pour over white chocolate layer in each glass. Refrigerate 4 hours or overnight.