Firstly, the gold-plated lid adds a touch of luxury and elegance to the product, making it more attractive and appealing to customers. This can help the product stand out on shelves and increase its perceived value.

Secondly, the gold-plated lid provides a secure and tight seal to the jar, preventing any leakage or contamination of the product. This helps to maintain the quality and freshness of the cream and ensures that customers receive a high-quality product every time.

Additionally, the gold-plated lid can be easily customized with the brand name or logo, which can help to increase brand recognition and loyalty among customers. This also makes the product more distinguishable from other similar products in the market, helping it to gain a competitive edge.

Finally, the use of a gold-plated lid can also contribute to the product's sustainability and eco-friendliness, as it can be easily reused or recycled. This helps to minimize the environmental impact of the packaging and promotes a more responsible and sustainable approach to product packaging.

Overall, using a gold-plated lid for a rounded plastic face cream jar with sloping shoulders offers several packaging advantages, including increased attractiveness, product security, brand recognition, and sustainability.