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 1/4 inch head space. Attach lids. Store in refrigerator for up to 2 weeks. Do Not Freeze. Do Not Process In Boiling Water Canner.