EDL stands for foundry Italy Dalong. In other words, the jewelry was processed by Chow Tai Fook on behalf of Italian Dalong Company.

It is a common form in the jewelry industry to find other jewelry processing enterprises to do OEM work. Just like Apple doesn't make its own mobile phones, it always looks for Foxconn to do OEM work. Jewelry OEM allows jewelers to focus on the development of jewelry styles. On the other hand, it can also reduce the production and processing costs.