As previously stated, Carnelian Spikes would usually Disenchant to Greater Celestial Essence x2, sometimes x3, and rarely Hypnotic Dust x4. This was a great investment, considering Carnelians go for around 20g each. 60g + 3.60g for the Jeweler Settings at Exalted yields a total of 63.60g, and Greater Celestial Essences sell for somewhere around 60g. Instant 100% profit.
It's not hard to see why the Disenchanting rates were nerfed, if you will, but it's unfortunate that Jewelcrafters and Enchanters no longer have this cash-cow. Upon disenchanting 14 of them last night, I received 9 Greater Celestial Essences, and 30 Hypnotic Dust. This still made the crafting and disenchanting profitable, but worth my time? It's borderline, but I don't think I'll be buying any more.
On a side note, Reputation grinding is terrible.
Cliffs aren't really necessary here, but:
-Carnelian Spike Disenchanting has been nerfed
-Usually get 4-5 Hypnotic Dust per Disenchant