I would just like to post that this is NOT Rare/Ex after March 7th update, nor does Serket drop a R/Ex version that I know of in place of Serket Ring. He still drops this ring with just a presumably lower drop rate.
Myself and 3 other LS mates were in Garlaige helping with a key hunt. 3 of us 75 and 1 70 (MNK likes punching skeles lol) with the 50ish PLD who needed key. As I ran down there i was thinking how i hadn't seen serket for awhile and was thinking about update and also thought he had a rare/ex drop now ala Lizzy and Emp. In the basement, sure enough, 4 RMT fighting him lol. I thought it was odd, maybe they didn't know ring was ex now? We watched as they fought it down to such a small sliver you could barely see serket's health... then.... they wiped! lol. The 4 of us rushed in and killed him in like 7 hits XD and the ring dropped. we were all pretty shocked, and our LS got a new toy. 2 of our mages are bouncing it around while we watch AH to see how history goes. I figure it could go either way especially if it drops from a KSNM now. Hopefully we can make some coin off this, but it was thrilling none the less.