Yes, Agate Phoenix Semiprecious Stone can be used outdoors, but it is important to take certain precautions. Agate is a durable stone, but it is still susceptible to damage from extreme weather conditions, such as prolonged exposure to sunlight, rain, and freezing temperatures. Therefore, if you plan to use Agate Phoenix Semiprecious Stone outdoors, it is recommended to choose a protected area, such as a covered patio or porch, where it will be shielded from direct exposure to the elements. Additionally, regular maintenance and sealing can help protect the stone from moisture and weathering.