Platinum is platinum, and gold is gold. There is no such thing as 18k platinum. In fact, as a counter sister of a jewelry brand, I suggest you start with platinum directly. Because platinum is a naturally occurring metal, it has a clear and pure white color, and because of its high purity, it will not fade and yellow after being worn for a long time. You don't have to take it off when you wear it to prevent water and sweat. Wearing it for a long time will turn yellow and fade. Generally speaking, platinum is recommended!