I don't know a lot about pricing jewels (but I'm about to learn), but...
I bought a ring a few months ago which was marginally better than the ring I had before.
The ring's properties were:
SDI 10 - FCR 2 - LRC 18 - DCI 12 - some resist (I want to say poison, but can't check it where I am now) 10
I paid 900k for it and thought it quite the bargain as it was exactly what I needed.
Yours would be worth substantially less, I would suspect, since resists are less in demand than DCI, but physical resist is hard to get on a mage suit.
So if I were to sell it, I'd charge somewhere between 500-600k. Or more specifically, I wouldn't pay more. Someone else might.