2. Soviet diamonds are cubic zirconia (CZ), which was first developed by the Soviets, hence the name. Artificial gem also has a small amount of natural zircon.

3. Swiss diamond cubic zirconia, same as above. There is also an artificial crystal (glass) coating, also called Swiss diamond.

4, American diamond silicon carbide, artificial gem, a small amount of natural.

5. The common name of South African diamond driller is named after South Africa produces world-famous high-quality big diamonds.

The above "Bangkok Diamond", "Soviet Diamond", "Swiss Diamond", "American Diamond" and "South African Diamond" are all common names among the people.

In addition, the national standard for jewelry and jade was implemented in 2004. Jewelry with place names has no origin meaning, and the word "artificial" should be added before the name of artificial gem.