In a large heavy bottomed pan, mix grape juice, lemon juice and gelatin. Bring to a full rolling boil over medium high heat, stirring often, then boil, stirring, for 1 minutes. Remove from ehat and stir in artificial sweetener. Wash 3 half pint glass jars or plastic freezer containers. Keep glass jars hot until needed. Ladle hot jelly into half pint jars or refrigerator containers, leaving 1 cm head space. Attach lids. Store in refrigerator for up to 2 weeks. DO NOT FREEZE. DO NOT PROCESS IN BOILING WATER CANNER. Origin: Home Canning, Sunset Magazine and Books. Shared by: Sharon Stevens.