What is the difference between pure gold and red gold?

1, gold content: the gold content of pure gold is above 99%, while the gold content of red gold is above 99.9%, so the purity of red gold is higher and closer to pure gold.

2. Color: Due to the different gold contents, the colors of pure gold and red gold are also different. Pure gold is light yellow or light yellow, while red gold is more vivid red or dark red.