It just seems a little unlikely that someone will pay 1500 diamonds without rares. I would just say try to get as many diamonds as you can but theres nothing wrong with rares and most of them are easy to sell.
Bump. Someone's offered 1500 diamonds. The trade should be happening in 13 hours (midnight BST). If someone wants to beat that, better do it before the trade.
Bump. Trade didn't go ahead. I overslept and my money came late, also I haven't been contacted by my buyer yet.