memo-jc

•1-30
30 x [Delicate Copper Wire] - 60 Copper Bar
Save these, you will need them later.

•30-50
20 x [Tigerseye Band] - 20 Tigerseye, 20 Delicate Copper Wire

You can make 20 x [Malachite Pendant] too.

•50 - 150
Learn Jewelcrafting Journeyman.

•50-80
50 x [Bronze Setting] - 100 Bronze Bar

Save these, you will need them later.

•80-100
20 x [Simple Pearl Ring] - 20 Small Lustrous Pearl, 20 Bronze Setting, 40 Copper Bar

or

20 x [Gloom Band] - 20 Bronze Setting, 40 Shadowgem, 40 Delicate Copper Wire

Make [Ring of Silver Might] if Silver Bar is cheap on your server.

•100-110
10 x [Ring of Twilight Shadows] - 20 Shadowgem, 20 Bronze Bar
You can also continue to make [Ring of Silver Might]

•110-120
10 x [Heavy Stone Statue] - 80 Heavy Stone
If Heavy Stone is cheap (usually it's not) make this one up to 130 if you want to.

•120-150
30 x [Pendant of the Agate Shield] - 30 Moss Agate, 30 Bronze Settings

The design sold by these NPCs.

If you prospect your own Ores, usually you will get a lot of [Lesser Moonstone] too, but even if you don't prospect the Ores, sometimes 2 Lesser Moonstone is cheaper than one Moss Agate. So get the recipe [Design: Amulet of the Moon] and use up all your Lesser Moonstone. The design is sold by these NPCs.

•150 - 200
Learn Jewelcrafting Expert.

•150-180
45 x [Mithril Filigree] - 90 Mithril Bar
Save these, you will need 45 of them later.

•180-185
8 x [Solid Stone Statue] - 80 Solid Stone
•185-200
15 x [Engraved Truesilver Ring] - 15 Truesilver Bar, 30 Mithril Filigree

•200 - 300
Learn Jewelcrafting Artisan.

•200-220
If Citrine is expensive, you can continue to make [Engraved Truesilver Ring] up to around 210 or maybe more, you will also need a bit more Mithril Filigree then.
The recipe will go yellow at 210, so you might need to get more Citrine if you are unlucky. If you are lucky you will only need 20.

25 x [Citrine Ring of Rapid Healing] - 25 Citrine, 50 Mithril Bar

•220-225
5 x [Aquamarine Pendant of the Warrior] - 5 Aquamarine, 15 Mithril Filigree
•225-250
50 x [Thorium Setting] - 50 Thorium Bar
Stop making these at 250 and only make more if you need it.

•250-260
10 x [Ruby Pendant of Fire] - 10 Star Ruby, 10 Thorium Setting
•260-280
If Large Opal is expensive on your realm, like it cost twice as much as one Star Ruby, then you should continue to make [Ruby Pendant of Fire] up to 275. Or if you Prospected your own Ores, you will have a lot of Star Ruby and Azerothian Diamond left, use all of them.
20 x [Simple Opal Ring] - 20 Large Opal, 20 Thorium Setting

If you reach 265 and you have some Azerothian Diamond, or it's cheap (I doubt that) you can start to craft [Diamond Focus Ring] too.

•280-290
10 x [Onslaught Ring] - 10 Powerful Mojo, 10 Essence of Earth, 10 Thorium Setting
or

10 x [Sapphire Pendant of Winter Night] - 10 Blue Sapphire, 10 Essence of Undeath, 10 Thorium Setting

•290-300
Make a few [Glowing Thorium Band] if you have some Azerothian Diamonds left.
10 x [Emerald Lion Ring] - 20 Huge Emerald, 10 Thorium Setting

•300 - 350
Go to Outland and learn Jewelcrafting Master.

Now from this part of this Jewelcrafting guide, you will use recipes that are already yellow to you and since whole WoW is pretty random, you might just need 5 gems to reach your desired skill or maybe 10.

•300-320
A nice alternative to 300-315 is this pattern:

15 x [Prismatic Black Diamond] - 15 Black Diamond

When you learn these recipes, they are already yellow. I suggest you to cut 30 from any of the following gems, then you should reach 320.

[Teardrop Blood Garnet]
[Brilliant Golden Draenite]
[Solid Azure Moonstone]
[Radiant Deep Peridot]
[Inscribed Flame Spessarite]
[Glowing Shadow Draenite]

•320-325
Make 5-7 from any of the following gems.

[Bold Blood Garnet]
[Bright Blood Garnet]
[Gleaming Golden Draenite]
[Jagged Deep Peridot]
[Luminous Flame Spessarite]
[Royal Shadow Draenite]
[Sparkling Azure Moonstone]

•325-335
Save these, you will need them later.

10 x [Mercurial Adamantite] - 40 Adamantite Powder, 10 Primal Earth

Make a few from any of the following gems, if you didn't reach 335.

[Enduring Deep Peridot]
[Glinting Flame Spessarite]
[Runed Blood Garnet]
[Shifting Shadow Draenite]
[Thick Golden Draenite]
[Purified Jaggal Pearl] - This one turns green at 332.

•335-340
Make 5-7 from any of the following gems.

[Dazzling Deep Peridot]
[Delicate Blood Garnet]
[Potent Flame Spessarite]

You can go to Hellfire Peninsual and find Kalaen if you are Horde, Tatiana if you are Alliance. These NPCs sell the following recipes.

[Rigid Golden Draenite]
[Sovereign Shadow Draenite]
[Smooth Golden Draenite]

•340 - 350
You can continue to make the gems above, if you didn't reach 350 by making the rings below.

10 x [Heavy Adamantite Ring] - 10 Adamantite Bar, 10 Mercirual Adamantite

•350 - 450
Go to Northrend and learn Jewelcrafting Grand Master.

•350 - 395
Buy around 55 from any of the following gems. After 375, the recipes will be yellow so you might need less or more.
[Bloodstone]
[Chalcedony]
[Dark Jade]
[Huge Citrine]
[Shadow Crystal]
[Sun Crystal]

Cut any random gem you want. Seriously there are like 50 new green gem recipes, I won't list all of them. Go to your trainer, learn one and make that recipe around 55 times.

•395 - 400
Make 5 from any of the following items:

5 x [Bloodstone Band] - 5 Bloodstone, 10 Cristallyzed Earth
5 x [Crystal Chalcedony Amulet] - 5 Chalcedony, 10 Cristallyzed Earth
5 x [Crystal Citrine Necklace] - 5 Huge Citrine, 10 Cristallyzed Earth
5 x [Sun Rock Ring] - 5 Sun Crystal, 10 Crystallized Earth

•400 - 420
23 x [Stoneguard Band] - 46 Eternal Earth
or

23 x [Shadowmight Ring] - 23 Eternal Earth, 23 Eternal Shadow

•420 - 425
You better make this 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.

7 x [Dazzling Forest Emerald] - 7 Forest Emerald

•425 - 440
Buy 15 [Skyflare Diamond] or [Earthsiege Diamond]

There are plenty of meta gem recipes, choose one of them and make it 15 times. 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.

•440 - 441
1 [Icy Prism] - 1 Frozen Orb, 3 Chalcedony, 3 Shadow Crystal, 3 Dark Jade
•441 - 450
More meta gems. Usually 13-14 [Skyflare Diamond] or [Earthsiege Diamond] is enough.