The resale value of any diamond jewellery should tell all about real value of it. Unless it is actually rare and special piece my understanding is that value dr

The resale value of any diamond jewellery should tell all about real value of it. Unless it is actually rare and special piece my understanding is that value drops massively moment the payment clears. Compare this to gold, silver etc. which do have labour, but still difference is mostly that and some buy/sell margin.