Not sure who invented this Redstone contraption but noticed people liked the filter/loader I made this too incase you didn't want the loader, so credit to who ever first made these.

Note. the beacons can be any item you like(I like to use cobble stone then use a anvil to rename it so that if cobble stone makes its way in it doesn't break)
and the Diamond is the item you want to filter out

~L Llama :)