I only have 2 max level jewelry crafters and have received several blue and purple mw's so far. They're still not worth doing imo and get junked immediately. The grain drops have been dismal on my account for some reason. I'm definitely not getting as many as others are reporting here. Been saving what I do get for months just to upgrade my own character's jewelry and I still only have one character with a gold set.
Perhaps I need to pay for another account and 20 extra character slots for my "RNG" to improve???