Heck, I've seen 10 scraps of a blacksteel blade scroll on sale for 250 diamonds twice now. Scraps of a blacksteel blade scroll occur 2 times in each of the top 8 levels of the Stone Forest challenge. 250 diamonds?!?!? All I have to do is wait 2 days and I can collect 50 of them. Or just take from my stockpile.
Did I mention that I am level 120? So much for level banding.