I was thinking about this recently, not because I m interested in making an investment (if only I had the cash), just out of curiosity.... What gems do people think will increase in value in the future? Gems that the market is pricing cheaply at the mo, but people think their price will increase in the future. Something like Paraiba (i.e. used to be relatively cheap, now is hugely expensive). I know its not possible to know the answer to this question, but I d love to hear others opinions on it.