As with all enchantments, health enchants give more hp than mag or stam enchants, but on Jewelry of the same level, the hp boosting or mag/stam boosting pieces all give the same value. I am pretty sure they should change this to be on par with any other enchantment, as it currently ruins picking a jewelry piece with health, b/c 65 mag > 65 hp. The jewelry should give the same % more hp as the enchants do, to stay balanced.
Sweet Mother, Sweet Mother, Send your child onto me, for the sins of the unworthy must be baptized in blood and fear