You guys are nuts. I've sold a couple of +10ish Magery 3/1 rings for 5-10 million,
with no other desirable mods whatsoever. With 11 DCI alone the ring should be worth more like 20, and for someone using a mage weapon, that HCI could be very useful too. OP, if you want, I'll give you 5 million right now for it if you're on Chessy. Bet I can turn a healthy profit on it.
Er, nevermind on that -- ring's on Europa. But anyway, my point stands.
edit: currently, there's only one 3/1 ring on any shard with 10+ magery. It's priced at 15mil, and it's vastly inferior to the OP's.