Again, yes the ring offer a little bit of extra stat, never said the opposit, but, in my server at least, it's going to cost you much more money on the melding to be on par with the rose gold one.
And don't forget that, for this DEX to be of any use, you have to "waste" 1 slot of materia for only 3 DEX.
Again, the extra DEX achieve litteraly nothing unless you hit the next wall, which you won't without using a lot of slot toward DEX, just for an extra 1% chance of parrying, which will reduce by 25% the damage, and works only with physical damage. (so, basically, verry little mitigation)
I'd rather just go for the tank one, stay at 211 DEX and use those slot for something else.

But again, the point is valide, and that's why I talked about it in the OP, the problem wasn't this, it was the attitude.