4 cups fresh sweet cherries (such as Bing, pitted)
1 1/2 cups unsweetened cherry juice
1/2 vanilla bean (split lengthwise)
1 package (1/4 ounce or 1 tablespoon) unflavored gelatin
1 3/4 cups buttermilk
3/4 cup heavy (whipping) cream
  Vanilla Cherry Sauce (and/or 6 to 8 whole fresh cherries with stems, for garnish)