Chinas Onyx Golden Years is a type of onyx marble that is commonly used for interior applications such as countertops, flooring, and wall cladding. While it is a beautiful and durable material, it may not be suitable for exterior applications in very humid climates.

Onyx is a sedimentary rock, and like other natural stones, it has certain inherent properties that should be considered before using it in outdoor settings. First, onyx is a porous stone, which means it can absorb moisture. In very humid climates, the high levels of humidity can increase the chances of moisture absorption, leading to potential issues such as cracking, staining, or discoloration.

Additionally, onyx is more susceptible to weathering and deterioration when exposed to harsh outdoor conditions. Extreme temperature fluctuations, freeze-thaw cycles, and constant exposure to rain and humidity can damage the stone, causing it to break down over time.

Therefore, it is generally recommended to use more suitable materials for exterior applications in very humid climates, such as granite or certain types of limestone, which are known for their durability and resistance to moisture.

If you still wish to use Chinas Onyx Golden Years for exterior applications in a very humid climate, it is vital to ensure proper installation and maintenance. This may involve sealing the stone regularly to minimize moisture absorption and choosing a suitable outdoor grade coating for added protection. Consulting with a local stone specialist or contractor would be advisable to determine the best course of action for your specific climate and application.