Now all major jewelry brands can be customized, but for international brands, customization is still more troublesome. Some brands need to be customized, or even sent to headquarters for customization, which takes more time. For international brands, it is best to go to offline stores to buy, or when you have enough time, to experience customization. International brands and physical store services are good, you can try them on. After all, the offline experience is better after spending so much money.
For domestic jewelry brands, it can be customized online. Now, most brands can. They all have their own official website or Tmall and JD.COM stores. There are also brands that have been customizing. You need to buy those with GIA certificates and those from these stores, which are more secure and the prices are more suitable. There is no brand premium, which has a romantic meaning. For example, Levi's diamond ring is only given to one person in his life, which means that he only loves one person in his life.
In short, it is reliable to customize jewelry online, but it is best not to be greedy and cheap.
I hope my answer is helpful to you.