Sprinkle the gelatin into 1 cup water and allow it to bloom, which will take about 5 minutes.
Meanwhile, heat the cherry juice and sugar in a saucepan over a medium-high heat until the sugar has dissolved, about 2 minutes. Remove the pan from the heat and slowly whisk in the bloomed gelatin until completely dissolved. Add in the lime zest and juice, stirring to combine.
Spray an 8-by-8-inch baking dish lightly with cooking spray. Pour the mixture into the pan and transfer to the refrigerator. Chill for 2 hours.
Remove the pan from the fridge and tip the chilled gummy block onto a board. Cut into 1-inch cubes. Carefully remove the individual gummies onto a baking sheet and allow them to sit out overnight on the counter. This will help give them a more gummy texture. Pack into resealable bags or mason jars.