Chow Tai Fook jewellery purchased in duty-free shops can still enjoy Chow Tai Fook's after-sales service after returning to China. Generally speaking, Chow Tai Fook's after-sales service includes cleaning, maintenance, repair, replacement and other services. These services can be reserved in Chow Tai Fook's stores or official website, and the specific service items and charging standards may vary according to regions and specific conditions.