Drain and rinse chickpeas thoroughly and place in a large glass or ceramic mixing bowl.
Add the lime juice, lemon juice, and diced red onion to the chickpeas, tossing to ensure even coating.
Allow the mixture to marinate at room temperature for 10 minutes to soften the onion's bite.
Incorporate the diced tomatoes, cucumber, and minced jalapeño into the bowl.
Add the chopped cilantro, sea salt, black pepper, and olive oil, stirring gently to combine.
Cover and refrigerate for 20 to 30 minutes to develop the flavor profile.
Carefully fold in the diced avocado immediately prior to serving to prevent oxidation.
Serve cold as an appetizer or light main dish with tortilla chips.