Serpent's Prism would have been a better name
While the profession is better designed than ever (with much less waste for shufflers and far fewer items ending up at the vendor), the Serpent's Eyes that you get while prospecting Mists ore tend to pile up. They're used to make the 450 crafted jewelry, but the market for that isn't nearly as large as the supply of Serpent's Eyes. Many people end up making these into blues and disenchanting them so they're not wasted.
Now that all JCs will have the option of turning three Serpent's Eyes into a prism every day, that will provide an outlet for the Eyes that may be more profitable than the 450 blues. So far, only a few Prisms have been opened, but they seem to award a random blue gem, just like prisms from expansions past. Since it's on a daily cooldown, it's unlikely to be able to push down the price of blue gems much.
Is it worth using Spirits of Harmony?
The new Primal Diamond recipe has no cooldown, but requires Spirits of Harmony which are their own sort of cooldown. One criticism of Jewelcrafting has been that JCs have nothing except research and extremely low-liquidity mini-pets to spend their Spirits of Harmony on. Jewelcrafters generate Spirits as quickly as any other character, and in theory, it'd be nice to have a JC option to use them on. Especially seeing as how anyone doing daily research will have almost certainly finished learning all their cuts by now.