Chow Tai Fook is a big brand in Hongkong, and it has a very high reputation in China. All kinds of jewelry he sells are really safe to buy.

Chalcedony is a kind of timely stone with relatively low price. Chow Tai Fook won't sell fake chalcedony, which is relatively cheap. Even ordinary jade shops don't recycle chalcedony. Chalcedony is too cheap because unless it is inlaid with gold, people may take a fancy to it. However, it is estimated that the recovery price of chalcedony inlaid with gold will be much smaller than the retail price. Maybe you can't trust it as a reference.