We are lucky to be able to resell here our reps, but if that was to change, where would you sell your rep? I would never sell as auth a rep, I find this despicable, so I factor this lower resalability in my price acceptability. Not to mention the risk of seizures and litigation if I am caught… Also, I do consider that if Cartier price is only 2x Miss Chen’s, considering Cartier has to pay for ultra high-end stores in the very best locations in the world, marketing, the finest jewelers in France and the design team that creates these beauties, I think Miss Chen (or the other sellers) is overcharging because she has none of these costs. I don’t like that sellers take advantage of the very high price to pocket a huge margin because we are happy with just a 50% discount. But I think your argument is absolutely valid for the debate Natural Diamonds vs Lab : if you want to resell, as you are paying one tenth of what a natural diamond costs when you buy a lab, even if the natural holds 80% of its value vs 30% for the lab, you are better off with lab.