Cook gemelli according to package directions. Drain and let cool completely.
Meanwhile, whisk together olive oil, vinegar, honey, salt and pepper; toss with pasta.
Using melon baller, scoop out 12 small balls each melon and cantaloupe; add melon balls, bocconcini and prosciutto to pasta. Toss well to combine. Stir in spinach and basil.
Recipe Notes
Tip:
For a simple variation, substitute crumbled feta cheese for bocconcini and mint for basil.