I can't call this a trophy I'm afraid. 8 dex = 16mana, so this is a 2/30/70/15 (3 good rolls and one decent one).
Usable for sure (it beats my current FW amulet), but if you look at the 30 amulet TR topic, you'll see better with fcr.
http://forums.d2jsp.org/topic.php?t=72236914&f=103I know of a few people who have non fcr ones that I haven't seen posted that have higher stats than yours coupled with high life rep.