Thickness of the real gold plating layer of course will affect the tranish, thick plating layer will help keep the plating color longer;

Most of the real gold plating fashion jewelry you can buy from market with the plating layer thickness only about 0.03um, but for some top brands, even the base metal is brass, or steel, the thickness of plating layer will more than 0.3um.

And anti-tanish protection will also help keep the color longer not tranish, like e-coating or electrophoresis.

If you try to find suitable wholesaler supplier for fashion jewelry, feel free to contact us.