When sourcing luxury items, authenticity is paramount. You must request detailed material specifications, such as full-grain leather grades or Swiss-movement certifications for watches. Ensure the supplier provides high-resolution macro photos of stitching, hardware engravings, and logo placements. For high-end apparel, verify the fabric weight (GSM) and composition (e.g., 100% Mulberry silk or Grade A cashmere). Professional buyers should prioritize suppliers on Made-in-China.com who hold SGS or TÜV Rheinland verified status, as these platforms conduct on-site factory audits to confirm production capabilities.