this very wisdom advice because both of them world's ancient payment methods. and it seems they never lose their values in the near times. in my country gold is also very common investment tool for people.
if you make investment gold is really good tool. because everyday it is getting more and more valuable as btc.
Besides that you already know, Jewelry has constant price. So, it will safe when you spend all money on it.
Rather you speculating with something virtual and you can get heart attack everytime. And, i think China Goverment has big plan for their economics with this persuation.