I have noticed several friends in social media who are selling gold jewelry of rings, bracelets, etc. Their spiel is the value of gold that is not depreciated which means the jewelry you buy now is a good investment for the future. Maybe I can agree with that selling point. However, how can I be sure that the gold bracelet I would buy is certified to be 18 K gold? That is the problem now because it is not easy to evaluate the value of jewelry.