Yes, Black Gold Marble terrace can be waterproofed. There are several methods and products available to waterproof natural stone terraces, including impregnating sealers, topical sealers, and waterproofing membranes. It is important to consult with a professional or a manufacturers instructions to determine the most suitable waterproofing method for your specific situation and type of marble. Additionally, regular maintenance such as resealing may be necessary to maintain the waterproofing effectiveness over time.