DeletedUser109385
Diamonds should be refunded when you sell a premium building because a lot of premium buildings go outdated when you reach higher ages so you need to delete that premium building to replace it with something up to date. and getting nothing back from selling that premium buildings is very annoying. Diamonds are the hardest resource to earn and is not fair that coins and supplies are refunded when buildings get sold but when premium buildings are sold nothing is refunded at all. I say when you sell a premium building you get a 80% refund, you would still have made a small loss of diamonds which seems fair to me as diamonds are very very hard to earn so you shouldn't lose too many of them.
P.S: I am going to format this idea later on.
P.S: I am going to format this idea later on.