As for the Ioun torch, if you lock up the item description it states it is a dull gray stone with Continual Flame cast on it. It is Caster Level 12 in the item write up.
Given the rules for PFS that spells are cast from the lowest level spell caster able to do so the Ioun Touch would act as a Level 2 spell with Caster Level 12. It can cancel Darkness but not Deeper Darkness, and has a caster level 12 if the target of a Dispel..
EverBurning Torch as for the description given I believe would be Spell level 2, Caster Level 3 from a wizard.
minimum level create an Ioun Stone is CL 12
Aura faint universal; CL 12th
Slot none; Price: 25 gp; Weight —.
These are ioun stones that have been burned out or otherwise rendered all but powerless. They retain the ability to float and orbit, and are useful as the target of spells such as continual flame, daylight, and silence, allowing you to keep your hands free. They may be any shape (cabochon, disk, ellipsoid, and so on).
Cracked: This stone has no powers. Price: 25 gp.
Flawed: This stone has no powers. Price: 25 gp.
See Inferior Ioun Stones for details on cracked and flawed variant stones.
caster level of Continual flame is 3 (Minimum) .. vs Dispel magic you would check vs the CL of the Spell not the Ioun stone... and dispelling the Ioun Stone would only make it stop floating for 1d4 Rounds