Romanias Verde de Creta Gneiss can be used for exterior applications in cold climates. Gneiss is a type of metamorphic rock that is known for its durability and resistance to weathering. It can withstand freezing temperatures, moisture, and other harsh conditions often associated with cold climates, making it suitable for exterior use. However, it is always recommended to consult with a professional architect or contractor who can evaluate the specific requirements of the project and provide accurate guidance.