The gap between these three companies is just like the gap between Nike, Adi and any local brand.
From the management point of view, Zhou Shengsheng only does direct selling, not joining, which ensures the quality and after-sales service of the goods sold; Chow Tai Fook is directly affiliated, but the management of joining is very binding, which also guarantees the goods and services to a great extent; I really haven't heard of it, but small brands in many regions will have problems after sales nationwide because of their brand influence and company strength.
In terms of goods, Zhou Shengsheng's payment style is really good, and Chow Tai Fook's forever mark series is also good. These are high-quality diamond commodities; But the disadvantage is that the price increase rate is high, and the diamonds of the same level will be more expensive than those of small brands.
If you get married, you'd better buy some and then look at other brands. Some powerful brands in the mainland are also good, such as I DO, Adil, Millennium Star, Old Temple, Lao Fengxiang and so on.