Regarding Size: Sizes are measured manually, and due to factors such as different measuring tools and methods, there may be a 2mm error. Please refer to the size chart and review details based on your usual wearing habits when shopping independently. Regarding Shipping: The default courier is ZTO Express. If you need another courier, please contact customer service. Orders placed before 5:30 on the same day can be shipped without needing immediate preparation. For products that require immediate preparation, customer service will contact you in advance Jewelry Maintenance: 1. Frequent jewelry changes are recommended; avoid wearing the same piece for extended periods, especially in hot summers. The coating on jewelry can easily corrode due to sweat exposure over time, so it's best to prepare multiple pieces for regular swapping 2. Contact with chemicals can easily damage jewelry The aroma of bathing, chlorine in swimming, and salt in seawater can cause erosion to the jewelry coating, so all jewelry should be removed before bathing or swimming 3. Collision can easily cause scratches, so be careful when storing. Do not overlap the jewelry together; instead, store them in their original packaging bags or in a jewelry box with separate compartments to avoid scratching surfaces due to mutual contact 4. Clean jewelry irregularly, using a soft fine-bristled brush to sweep the surface of the jewelry to remove surface stains 5. Apply a layer of transparent nail polish on the metal surface to prevent contact between the ornament and air, making it last longer