Let’s get straight to it: Most diamonds lose value the moment you walk out of the store. That’s because retail markups, branding, and all those extra costs get baked into the price you pay. When you try to sell, buyers only care about the diamond itself, not the story behind it or the fancy packaging. So, while diamonds stay beautiful and durable, you’ll usually get less than you paid if you try to resell them. The exception? Some rare, top-quality natural diamonds can hold their value better—if you’re lucky enough to own one.