Emerald is divided into categories, quality and authenticity, regardless of brand, but the quality and reputation of big stores are relatively guaranteed, with certificates, but the price is relatively high, and the rent of other stores is also high. Many small shops are also well processed on the spot. There are too many fakes on the beach, even online, but you just have to learn to identify them yourself. If it can be identified, the online price is the lowest. If you receive it, you will return it. Say yes first.