1. Different materials and techniques: Although Zhou Shengsheng and Chow Tai Fook's Zhongtian Beads are all pure gold, their manufacturing techniques and materials are different, resulting in different costs.
2. Different brand premiums: Zhou Shengsheng and Chow Tai Fook are both well-known brands, but their brand premiums are different. Chow Tai Fook's brand premium is relatively high, so the price is also relatively high.