The abbreviation of "perfect" means that 3 ex stands for "perfect", 3ex means that cutting, polishing and symmetry are perfect, so 3ex means that the quality of diamond cutting is perfect.

Zhou Shengsheng Hongkong brand, which is relatively loud and guaranteed, has never been heard of for a hundred years. It is estimated that the price is lower than that of Zhou Shengsheng, because the brand scalpers have high profits. When it comes to diamonds, you only need to look at 4c, but when it comes to 3ex, you need to bring a GIA certificate. If they are all 3ex, then compare the other three indicators, such as weight, color and clarity. If these indicators are the same, it depends on whether you want a big brand or have an advantage in price. Give you a qq. You can add me 1 1 27 905 29. If you still don't understand anything, please choose my answer!