As of this post there is an NPC in the Suk-Krath temple of Allanak who, for a price, will do something very useful for your gemmed magicker.
Normally I do not post trivial changes such as this, but this is something that PC gemmed magickers should very likely know about, and will likely change their (social) life. (Yes, I am being vague on purpose. Magickers will find out quickly what this is, and those who want the mystery preserved get to have their cake too.)
Please report any bugs with this directly to me.
Note that this is the absolute only service of this sort that will be going in. Other suggestions will not be entertained.