Buyers should prioritize Natural Grade A Granite to ensure long-term weather resistance and structural integrity. It is essential to verify the surface finish type (e.g., polished, honed, or flamed) as this affects both aesthetics and algae resistance. For outdoor installations, ensure the stone has a low water absorption rate (typically <0.4%) to prevent cracking during freeze-thaw cycles. Additionally, confirm that the carving depth and detail meet your brand's quality standards, especially for hand-carved bespoke pieces.