What any commodity is worth Marcus is simply how much you are prepared to pay for it and when you walk away you feel that you have a good deal.
Someone paid $50 million dollars for Van Gogh's painting of a bowl of sunflowers, in my opinion it isn't worth the price of a bag of crisps.
That is the difference in what something is worth.
Diamonds are internationally excepted as being priceless which should give you some idea of how stupid humans can be, diamonds are as common as coal,and no more worthy, they are worhless baubles which the idiot people buy thinking they have an investment.
Buy your girl an engagement ring for five thousand pounds and when you break up a month later, try getting more than �200 quid for it.
People like like De Beers are as rich as they are because of the mind numbigig stupidity of the rest of us believing their fairy stories.