Okay. And we're supposed to care about this why, exactly?
I did not have the foresight to think of obtaining the ring through some other means before my raiding week started at the beginning of the patch, so I only have 12 bosses killed where I have collected [Elementium Gem Cluster]. Through these 12 kills, one of them being heroic, 10 have given me two [Elementium Gem Cluster] the other 2 kills only gave me a single one. The most [Shadowy Gem] that I have recieved from a single cluster was 9, the least 5, On most kills where I get two clusters, I get 11 total gems, coming in stacks of 5 and 6 respectively (this has happened on more than half of the clusters I've opened.)
So far I am 132/333 [Shadowy Gem] which averages out to a straight 11 gems per kill.