Celtic Heroes

Hi, i am trading a +20 dex +100 helth Kron ring for a +20 dex +100 energy ring.

Also, how much are kron items worth?
And cormak?

I had a kron ammy lvl 90
I bought for 10k and sold for 70k
I'm assuming lvl 90 ones are 30-80k?
And lvl 40 ones
10-30k???
Hope this helps