Compared to the old enchantment system, the new system will ensure the enchanted effect which means higher quality Gem will definitely give better effect.
The previous ranges of extra HP values randomly offered by different gems for enchanted items are no longer applicable. In the new enchantment system, the gems you consumed will bring certain HP enhancement according to their type and quality level. Thus, you no longer have to be very lucky to hit the extra HP cap, which is still 255 in the new enchantment system, but now can certainly make it with enough gems consumed.
