When sourcing diamond buttons, it is critical to distinguish between genuine diamonds, lab-grown diamonds, and glass/crystal (rhinestone) alternatives. For high-end B2B procurement, ensure the base metal is corrosion-resistant, such as zinc alloy, brass, or stainless steel, to prevent tarnishing. The 'diamond' setting should use prong or bezel settings rather than simple glue to ensure the stones do not fall off during industrial washing or dry cleaning. Always request a hardness test report or material composition analysis to verify the stones meet your brand's quality tier.