First up, Shifting Twilight Opal will now finally exist in game. This purple gem should be a great possible choice for tanks looking to fill out a metagem or slot bonus requirement, especially. It's available from Tiffany Cartier in Dalaran.
The other new recipes are actually nice and conveniently straight from the trainer. There's 2 blue rings and 2 blue amulets, one each of caster and melee stats, with plenty of stamina and resilience:
Kaliope notes that some of those gems, specifically Forest Emeralds and Sky Sapphires, are rather low profit anyway, and that this jewelry is likely to be in demand among players looking to break into the Arena at the start of the new season that's coming with 3.1. The new recipes are also all in prime position to be valid skillup paths, with the Shifting Twilight Opal learnable at 390 skill and the new PvP jewelry learnable at 420 skill.
Patch 3.1 brings us Ulduar, dual specs, significant changes to all the classes, and more! We've got you covered from top to bottom with our Guide to Patch 3.1.