When evaluating quartz watches, the movement is the heart of the product; prioritize Japanese (e.g., Miyota, Seiko) or Swiss movements for higher reliability compared to low-end domestic ones. The case material should ideally be 316L Stainless Steel for durability and corrosion resistance, though Zinc Alloy is a common cost-effective alternative for fashion jewelry watches. For the crystal (glass), Sapphire glass offers the best scratch resistance, while Mineral glass with sapphire coating provides a balance of price and performance. Ensure the water resistance is clearly defined, typically 3ATM (daily splash-proof) for fashion styles or 5ATM/10ATM for sports-oriented fashion pieces.