Buyers must specify the hole type (full-drilled, half-drilled, or no-hole) based on the final use case, such as jewelry making or shoe decoration. Size consistency is critical; professional suppliers should maintain a tolerance of ±0.05mm. Additionally, confirm the color fastness rating, especially for dyed pearls, to ensure they do not bleed onto fabrics. For industrial use, check the impact resistance of the ABS base material to ensure the beads do not crack under pressure during automated sewing or riveting processes.