Strange reaction on opinion. I thought we are here to learn something and discuss.
Ok, first skull should be hollow and as such ring shouldn't be heavy.
Second, based on pics you provided I do see casting pore between bones at right side. That part does not match other rings on your pic. And that can not be from wear. Compare that part with other rings pic of that design you provided, lines are thicker. Also dot on forehead also looks like pore.
However clear good large size pics inside and outside, hallmarks etc would help to clear this.
Fact that ring has been bought from dealer does not prove anything.
Ado, no offence here. If you not happy with my comments about your ring, I won't anymore.