From Gluten Free in San Antonio:

Luce is one of the best Italian restaurants in San Antonio. They have several dishes that are GF, such as steaks and risotto dishes. They also have GF pasta available even though it is not listed on the menu. I recommend the risotto dishes as well as the caprese salad. Let the server know that you need to eat GF and request that meats are not breaded when you order. They also have creme brulee, gelato, and sorbetto on their dessert menu.