the chrysopraise is just a large gem. all artifacts get one decoration in the base material, so it gets one decoration in chrysopraise. ive gotten 2 gem artifacts so far in my current fort, a perfect saphire and a saphire ring. the ring was called "the rage of killers" and it menaces with spikes of saphire. ive hidden it away in an iron bin in my kings tomb so i can come back and get it as an adventurer and punch people in the face while wearing it. talented gemcutters will sometimes make large gems or gem crafts as a byproduct, which can give you neat things like solid black diamond cups.
as for artifacts, i have a lay pewter shoe which has a picture of a goblin being killed by a sasquatch. just one lay pewter shoe, ive forgotten which workshop it came from.
my first artifact in my current fort was a steel anvil with bands of steel. otherwise unremarkable, its name however is is great, " whirledbrides the valley of haunting". one of the few times ive gotten a nice name for an artifact.
there is also a turtle shell toy axe called "fearbeatles". it has lots of spikes and a picture of the dwarf who made it coming to live in my fort. i like to imagine a small dwarf child running around mashing large roaches with this.
my most recent artifact had me stopping a miner from making an artifact weapon rack out of bituminous coal using forbid. the silly little guy claimed a workshop right in my raw adamantium stockpile room, so i got him using that instead. it ended up with the name "the ominous joy". now if only i could put my adamantium artifact axe in it.
finally, i have a tonne of other interesting artifacts with extremely funny names, but the crown of all of them was in my second ever fort when i got an aluminium spear. not that awesome, but a few years later i got a cave spider silk thong. with an image of the aluminium spear on it. in raw aluminium. that was incredible.