I figured this would be the best thread to post this in.
Divine Emblem will increase your next divine spell (tested with flash) by 50% enmity. This increase occurs separately from normal +enmity enhancement like merit and gear. For instance, if you have a naked PLD with +4 enmity merits and he uses flash with emblem active, the calculation would be:
180CE * 1.04 * 1.5 = 280.8 (floor)~ 280CE
I have not tested this with sentinel yet, but I suspect it would stack. I updated the page here
http://kanican.livejournal.com/18921.html
SE <3s PLD