Part 4: The Final Grind - Northrend: Jewelcrafting 350-450
351-395: Buy around 55 from any of the following gems, after 375 the recipes will be yellow so you might need less or more. Make sure you buy a mixture of these and not just one particular type, mainly because some gems just don't sell enough as compared to others.
- Dark Jade
- Huge Citrine
- Shadow Crystal
396-400: Make 5 from any of the following items:
- Bloodstone Band
- Crystal Chalcedony Amulet
- Crystal Citrine Necklace
- Sun Rock Ring
From here on you would be able to do the "Jewelcrafting daily" on a daily basis, regardless of whether you want to power level to 450. Would definitely recommend doing it mainly because you would be needing a ton of Dalaran Jewelcrafter's Token for a number of purposes which would include, learning new designs, buying Dragon's Eye etc..
401-420: Again a choice here between StoneGuard Band and Shadowmight Ring. The first one just requires Eternal Earth while the 2nd ring requires 23 of Eternal Earth and Eternal Shadow. The prices on Eternal Earth seems to be cheaper normally. Also if you have mining you could gather quite a bit of the mats for these by just mining Cobalt ore and Saronite ore in Northrend.
421-425: You better make this "Dazzling Forest Emerald" yellow recipe until it turns green, because after this there will be only meta gems, and they are a lot more expensive. Forest Emerald is usually the cheapest gem.
426-440: Buy 15 Skyflare Diamond or Earthsiege Diamond
There are plenty of meta gem recipes, you could choose one of them and make it 15 times. Although I would recommend making one of the following meta gem or both to maximize your profits since you are guaranteed to sell them almost immediately and for a good amount of gold:
- Chaotic Skyflare Diamond
Relentless Earthsiege Diamond
You can learn some recipes from your trainer, and some of them are sold by Tiffany Cartier in Dalaran, there is also a lot of them dropped by bosses and mobs around Northrend.
Alternatively if you are not in a hurry to max out your profession you could take it slow and make some Icy Prism. Although it has a 20-hour cooldown it can reward you with 2-3 rare gems and also a Dragon's Eye if you get lucky.
441-450: There is no point in leveling further than 440. If you want to level further, just continue to make meta gems.