Trim the top and bottom off the watermelon. Cut off the rind and discard. Cut the watermelon into planks, then into strips, then into twenty-four 1-inch cubes.
On each skewer, add 1 watermelon cube, 1 mint leaf, 1 mozzarella ball, and 1 blackberry. Store the skewers in refrigerator until ready to serve.
Drizzle the skewers with honey or balsamic glaze and sprinkle with the salt. Salting watermelon enhances the fruit's natural sweetness and helps to balance the overall bite.