Overall, most enchanting mats held value surprisingly well with the drop of both 3.1 and 3.2. In fact, they even rose for a few weeks on my server. The notable exception was the Abyss Crystal, which dipped noticeably with a farmable ToC.
The mats market is really depressed now, with Infinite Dust selling for less than 1.5g/each. Hard to think that would go too much lower, but I suppose the shards could still drop, too.
