As you can see, a level 1 [[Ruby]] grants +2 [[Strength]], while a level 2 [[Sapphire]] grants +4 [[Willpower]] and a level 3 [[Emerald]] (as seen in the [http://www.youtube.com/watch?v=UNP8QiNbFmU Gamescom 2010 Artisan video]) grants +7 [[Dexterity]].
If we assume It is possible that all it is always a 75% increase in an attribute per level of the gem, and that the +2 from the Chipped [[attributesRuby]] are worth equallyis increased by 75% to 3, 5 on the Flawed [[Sapphire]] and then rounded (to the closest number without a decimal) to an even 4. The +4 from Flawed [[Sapphire]] increased by 75% equals 7, like we can see that every upgrade of a gems level increases on the bonus of it by roughly 150%[[Emerald]]. All of this is pure speculation and highly likely to change, since itemisation is one of the last things that gets done in the development of the game. But it is an intressting thought, and if this theory holds true, then a maxed out (level 14) [[Ruby]] (or any gem that increses an attribute, I am just using a Ruby as an example) would give +3287 Strength if it was socked into something other than a weapon or a helm, which is a massive upgrade from the level 13 [[Ruby]] that would "only" give 1878 Strength.
