T7 is different from pure gold. The main differences are as follows:

1. Different gold contents: Tianjinjin T7 contains 80% gold, and Qianjinjin contains 99.9% gold.

2. Different compositions: T7 is a metal alloy, which is composed of copper, silver, zinc, aluminum, nickel, tin and other metal elements, while T7 is only composed of gold.

In a word, there are obvious differences in gold content and composition between T7 and Qianjinjin. When buying gold jewelry, you need to pay attention to the distinction.