Personally, I usually price used items at a discount (like 25-30% or more) off their current retail price.
That makes more sense to me than considering what you originally paid for an item. Because, for ex., a piece could have been bought for pennies on the dollar of its current retail price if you bought it many years ago. Or, as in the case of lab diamonds, the retail price could have dropped considerably from what you paid several years ago.
I forgot to add that I think sometimes the luxury, branded, in high demand stuff might go by different rules anyway. I mean, I guess the correct price is what someone is willing to pay, so if it's something in high demand and hard to get, then maybe that's a situation where it could go for the same as or more than retail.
Also, I have no idea why I keep posting about this topic when I don't even really care about it that much.

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