I don’t know how I only realized it now, but the recently implemented patch 3.0.8 added 13 new world drop jewelcrafting recipes. From the greatness that is wowhead, here they are. These drop only if you are a jewelcrafter, regardless if you’re 450/450 or 1/75.

Design JC Level
Meta
Design: Beaming Earthsiege Diamond 420
Design: Destructive Skyflare Diamond 420
Design: Thundering Skyflare Diamond 420
Orange (red or yellow slot)
Design: Champion’s Monarch Topaz 390
Design: Etched Monarch Topaz 390
Design: Inscribed Monarch Topaz 390
Design: Resolute Monarch Topaz 390
Design: Stalwart Monarch Topaz 390
Green (yellow or blue slot)
Design: Misty Forest Emerald 390
Design: Shining Forest Emerald 390
Purple (red or blue slot)
Design: Purified Twilight Opal 390
Design: Sovereign Twilight Opal 390
Design: Tenuous Twilight Opal 390