Trying to price for fast sales or for profit?
The shards are worth ~700 gil. The squares are worth very little. Your time is worth however much you think it's worth.
The NPC buys them off you at 400 gil, so that's the lowest you should ever sell them.
I'd say a fair price that should move fast, assuming other armorers check the wards instead of making them themselves would be between 1,500 and 2,000 gil.
Since they're needed only for a rank45 synth, and require rank25 to make, any armorer that needs them can supply themselves; not a very good choice for a profit synth, but perhaps you can bang on convenience and move lots of them.
FFXIV: Cloe Delisle
Scholar, officer of the SWAGGER Free company, Sargatanas server.