Yes, Zhou Dasheng can return the necklace within seven days after purchasing it. According to Article 16 of the Law of People's Republic of China (PRC) on the Protection of Consumer Rights and Interests: "Consumers have the right to return goods according to the principle of voluntariness within seven days after purchasing goods or receiving services, and merchants shall go through the formalities of returning goods according to the requirements of consumers.

Gold belongs to a special commodity, which is perishable and generally does not last for seven days for no reason. If the merchant promises to return the goods unconditionally, it can be returned. Otherwise, the merchant can only claim to terminate the sales contract if there is fault or other breach of contract, otherwise it can't return the goods.

Jewelry products can be returned within 7 days from the date of actual receipt, and can be exchanged within 15 days. However, if your coupon is used, it may not be returned. You can think about it.