It is a genuine Le Creuset. The underside is imprinted with "Le Creuset." I believe the same way you know it's legitimate as with a Gucci bag is to get it from a reputed retailer. I purchased mine from Amazon. It works perfectly, and I'm pleased. However, anything you buy on Amazon should be considered as promotional until they say otherwise. They often sell out early. Be sure to check again later if you're interested in buying it.