Trap the Soul
While trapped within the gem, the target remains in a state of Suspended Animation, unaware of its surroundings or what is occurring outside the gem. The target remains trapped within the gem until the gem is broken, at which point it is immediately freed.
A target's Truename is a powerful thing, and often very difficult to obtain. Some creatures will guard their Truename, if it is known to them, with great ferocity. A great deal of research must usually be undertaken in order to discover the Truename of a target.
The more dangerous and skilled the target, the more valuable the gem needed to trap them (i.e. the gem must be worth at least 1,000gp per level obtained by the target). Research or divinations may be necessary to determine the required gem value. If the gem is not valuable enough for the target, the gem shatters and the ritual fails.