There are two national jewelry tests in Shandong, not in Zibo.

Jinan Gemstone Product Quality Inspection Station, Keyuan Road 19, Jinan City, Huang Wenhui

2.  Gem Quality Supervision and Inspection Station Zhu, P.O. Box 18.

Zibo has more formal testing institutions.

Zibo Testing Station of Shandong Gemstone Testing and Research Center;

Zibo Gold and Silver Jewelry Detection Supervision Station Zibo Zhangdian Food Street West Head (Liu Quan Road 102)

Gold and Silver Jewelry Shop Linzi Branch (No.71Qiyuan Road, Linzi)

Inspection fee: 5- 10 yuan/piece for merchants or members.

A single 80- 120/ piece is only used for testing, not for evaluation.

This is the case in Dalian, where there will be differences, but not too much difference.

I hope the answer can help you.