When purchasing pearl beads, you must evaluate the Luster, Surface Quality, Shape, and Nacre Thickness. For bulk orders, ensure the luster is sharp and bright rather than dull. Surface quality should be graded (e.g., AAA, AA, A) based on the percentage of blemish-free surface. Additionally, verify the hole drilling precision; holes should be centered and smooth to prevent thread breakage during jewelry assembly. For shell pearls or imitation pearls, confirm the coating durability to ensure it does not peel under friction.