There are 8 types of jewels... STR, DEX, and INT, Armor, Crit, Damage, Health and Mana. We know what the STR, DEX and INT (Mind) jewels will yield for each jewel level. Developers have yet to release what Armor, Crit, Damage, Health and Mana jewels will yield for each level. However, Para gems, which are set at +7.0 Damage (+2.0 Dmg on stack) will probably outclass the Damage gems unless developers nerf para gems at lower levels, adjusting the damage based on equipment level. They probably won't, but if the disparity becomes a serious problem, developers may make an exception.