Kk stands for manufacturer code. There is no marking method like KK. Usually, KK stands for manufacturer code.

Jewelry has a broad sense and a narrow sense. Jewelry in a narrow sense refers to jade products. Broadly speaking, jewelry should include jewelry, handicrafts or other treasures made of gold, silver and natural materials (minerals, rocks, organisms, etc.). ) and has certain value. Therefore, there was a saying of "gold and silver jewelry" in ancient times to distinguish gold and silver from jewelry.