Have you ever wondered what the most valuable substances on earth are? If you did and thought gold would be among them then you’re right. Gold is not only one of the most traded substances on earth, but it is also one of the most valuable substances by weight. If you were to buy a gram of gold it would set you back around £22/$33. So, what about other substances? Bullion Vault’s new infographic explores how much a gram of various different substances, most naturally occurring, would cost…