Based on the natural, plant-based ingredients and mild surfactants in this product, it should be safe for use on onyx when tested in an inconspicuous area first and used as directed. However, some essential oils can potentially cause damage to certain stones.
As a precaution and to ensure the best care of your onyx surface, we recommend checking with your onyx manufacturer or a stone professional to verify compatibility before using the product on the entire surface. Your onyx is a special material, and we want to make sure any product used on it is well-suited and helps maintain its beauty.