The tried and true method to test ivory is the famous "hot pin test". This method is used by beginners and experts alike. Because true ivory is virtually impenetrable with heat, this is a good test and will
not damage the item if it is "real". Take a pin, large needle, or better yet a large straightened out safety pin, and heat the tip RED-HOT. Poke the item somewhere that it will not show. If it is real ivory, it will NOT penetrate and only leave a tiny tiny mark. If it is a resin, it will enter the item and produce a little crater around the hole. Now the big test… smell the "smoke" that comes of the test as you are poking it. If it is real ivory, it will have that unmistakable
smell of the dentist's office when you had that filling . It smells like burning tooth. If it smells like burning plastic, it IS. Now, bone is also resistant to heat, but not as much as ivory. The smell is less (or hardly at all) and is different than that of burning tooth.