Idk the exact value, but I bought a bunny head on hellblock for 2 stacks of cobble on Hellblock, and a stack of iron blocks on .net.
This is just what I think but in 6 days a $400 donor gets 19 stacks of redstone! There are about 10 (just a guess) $400 donors meaning that every 6 days 190 stacks of redstone gets introduced into Skyblock and there is then or the other donors meaning that I think that is probably only worth 1-2 diamonds I'm sure loads of people won't agree with me though :/
64 Wood planks = approximately 5-10 grass Therefore, 64 sticks = 2.5-5 grass 2.5-5 grass = UGH MATH 21/1 = 5/x 21x = 5 x = 5/21 5/21 = 0.2380952380952380 Round that to 0.24 21/1 = 2.5/x 21x = 2.5 x = 2.5/21 2.5/21 = 0.11904761904761904 Round that to 0.12 Therefore, 64 sticks = 0.12-0.24 diamonds.