They are good relics. They enable people spending platiniums to have better stats, and also to make gold (look at the price these gems are sold on market).
These gems should give advantages, but not to the point where free players have absolutely no chance in PVP. If it was the case, then some free players would just stop playing, and it would harm the popularity of the game.
So it's a difficult balance, and I think the stats of these gems are pretty well balanced. They give better stats and gold to players who buy platiniums without killing the game for free players.
In my opinion it's not a bad thing that Petrified Fang has very good stats : it gives a goal for free players to improve their stats and have a chance to become a little bit more competitive.
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