JL should be the brand abbreviation of Li Jun. This businessman mainly deals in platinum and gold jewelry. Sufficient platinum means that its platinum content will not be less than 990‰. If it is purchased through formal channels, the quality should be guaranteed. The first criterion for judging authenticity is price measurement. Now platinum is about one gram of 450 yuan. It can be estimated in grams. If it's too cheap, it's suspicious. The second is to find out whether there is a PT990 logo on the ring. If not, you can go to the local quality supervision and inspection station for identification.