I think it's Shenzhen, because Shenzhen is the distribution center of China's jewelry industry. Domestic famous brand jewelry companies and most jewelry companies are located in Shenzhen Shuibei, while some domestic Hong Kong branches or some foreign companies are located in Sha Tau Kok, Shenzhen, which is very close to Hong Kong!

And every year in March and September, there will be a jewelry exhibition in Shenzhen and Hong Kong, so you can go shopping!

There are more jadeite in Guangzhou than in Shenzhen, and there are many wholesale places in Guangzhou. And there are more diamonds in Shenzhen than in Guangzhou! There should be many stores of major brands in Beijing, but there are not many companies, and the market will definitely be smaller!

If you want to do jewelry business, you should come to Shenzhen. Maybe you will make up your mind if you come and see it!