There are not many fake olive stones in the market, and many cases can be distinguished by appearance and color. Three-twist olive is distinguished from the real by its shape and color. Merchants use inferior olive cores carved by machine to pretend to be hand-carved, but these so-called fake core carvings are generally carved with resin or dyed artificially, which is very easy to distinguish. The true olive core is even in color, oily in color, and has a thick patina on the surface, while the fake nuclear carving is generally light in color and looks very new, and it will not form patina after playing for a long time.