I know this suggestion is a little unrelated to the things currently being developed, but i wanted to put it down before i forgot.
Supergems -
I was playing DF the other day when my jeweler went into a fey mood, and proceeded to create a "perfect something gem". needless to say i was very disappointed and Urist McJeweler soon took a trip down the adimentine spire. This made me begin to consider the nature of artifact gems, and how they could be improved. The result of this is the following idea.
Supergems!
A super gem is a single randomly generated gem, similar to the way titans and forgotten beasts are generated. They are found inside the top of an adimentine spire; one per spire. They would be incredibly valuable, pre-cut and even have an effect. the description format would be something like this.
[name] a [type of gem cut] shaped gem, fixed to the forces of [sphere].
It is [color] and [adjective] and is said to have [effect]
or for an example,
Storm caves, a square cut shaped gem, fixed to the powers of death.
It is black and glistening and is said to emit poisoning vapors.
You wold be able to set it in an object like any other gem, but the object would then become an artifact of the stones name and retain any effects from the stone. This way you could do something with it like make an awesome crown for your king, or anything you want. The stones could be aligned with good or neutral things as well, and i think it would be cool if the effects could affect thoughts, "and is said to endow happiness and good thoughts." this would add some flavor and variety to the deeper levels and give you another reason for digging deep.
Thats all i can think of for this suggestion right now, so any thoughts?