I got 9 black this morning along with a few others. Considering drop rates (about 10 gleam in a normal roll from my count) I’d put it at least 2k per block while the event is on, probably 5k after. Remember roadrunner feathers still go for at least 4k and they aren’t even exclusive, and neither do they have such variety. Then there’s the new planets which will surely contain new gleam colors themselves as well as the farming update mentioned above which has been said to unlock new colors. So it would seem we’re starting with hyper rarity, moving on to semi rarity with existing planets, and finally common rarity with farming. May be best to hold your goods til the dust settles.