Of course you can't get full retail value when reselling a luxury good. That's as true of Tiffany rings as it is of Macbooks. But there is a conspiracy to expl

Of course you can't get full retail value when reselling a luxury good. That's as true of Tiffany rings as it is of Macbooks. But there is a conspiracy to exploit people desperate enough to have to liquidate their jewelry. It's detailed in the article linked to by the OP. That conspiracy is what causes jewelry to have a resale value of maybe 20%. Compare this to 6-month old MacBooks Air (worth ~80% of their retail price) or a car you drive off the dealer's lot (worth ~80% of what you paid).