When evaluating ABS (Acrylonitrile Butadiene Styrene) pearl beads, you must focus on material purity and coating quality. High-quality beads should feature a multi-layer environmental protection coating to ensure a smooth, high-luster finish that mimics genuine pearls. Key specs include hole diameter consistency (crucial for automated stringing), sphericity tolerance (ideally within ±0.05mm), and peel resistance, which ensures the pearl essence does not flake off during garment processing or jewelry assembly.