300-305
Make any of the following to get to 305.
You need to make about 10-15.

Teardrop Blood Garnet (1 x Blood Garnet)
Inscribed Flame Spessarite (1 x Flame Spessarite)
Radiant Deep Peridot (1 x Deep Peridot)
Glowing Shadow Draenite (1 x Shadow Draenite)
Brilliant Golden Draenite (1 x Golden Draenite)
Solid Azure Moonstone (1 x Azure Moonstone)

305-310
Make any of the following to get to 310.
You need to make about 10-15.

Bold Blood Garnet (1 x Blood Garnet)
Luminous Flame Spessarite (1 x Flame Spessarite)
Jagged Deep Peridot (1 x Deep Peridot)
Royal Shadow Draenite (1 x Shadow Draenite)
Gleaming Golden Draenite (1 x Golden Draenite)
Sparkling Azure Moonstone (1 x Azure Moonstone)
Bright Blood Garnet (1 x Blood Garnet)

310-315
Fel Iron Blood Ring (1 x Fel Iron Bar, 2 x Blood Garnet) x 5

315-320
Make any of the following to get to 320.
You need to make about 10-15.

Runed Blood Garnet (1 x Blood Garnet)
Glinting Flame Spessarite (1 x Flame Spessarite)
Enduring Deep Peridot (1 x Deep Peridot)
Shifting Shadow Draenite (1 x Shadow Draenite)
Thick Golden Draenite (1 x Golden Draenite)
Stormy Azure Moonstone (1 x Azure Moonstone)

320-325
Azure Moonstone Ring (1 x Fel Iron Bar, 2 Azure Moonstone, 1 x Deep Peridot) x 5

325-335
Make any of the following to get to 335.
You need to make about 15-20.

Dazzling Deep Peridot (1 x Deep Peridot)
Delicate Blood Garnet (1 x Blood Garnet)
Lustrous Azure Moonstone (1 x Azure Moonstone)
Potent Flame Spessarite (1 x Flame Spessarite)
Rigid Golden Draenite (1 x Golden Draenite)
Smooth Golden Draenite (1 x Golden Draenite)
Sovereign Shadow Draenite (1 x Shadow Draenite)
Mercurial Adamantite (4 x Adamantite Powder, 1 x Primal Earth)
I would suggest making the Mercurial Adamantite, as your going to need that next.

335-350
Heavy Adamantite Ring (1 x Adamantite Bar, 1 x Mercurial Adamantite) x 15

350-355
Make any of the following to get to 355.
You need to make about 10-15.

Luminous Noble Topaz
Lustrous Star of Elune
Potent Noble Topaz
Radiant Talasite
Rigid Dawnstone
Royal Nightseye
Runed Living Ruby
Shifting Nightseye
Smooth Dawnstone
Solid Star of Elune
Sovereign Nightseye
Sparkling Star of Elune
Stormy Star of Elune
Subtle Living Ruby
Teardrop Living Ruby
Thick Dawnstone
Bold Living Ruby
Bright Living Ruby
Brilliant Dawnstone
Dazzling Talasite
Delicate Living Ruby
Enduring Talasite
Flashing Living Ruby
Gleaming Dawnstone
Glinting Noble Topaz
Glowing Nightseye
Inscribed Noble Topaz
Jagged Talasite

Really, just make 10-15 of whatever you have the materials and recipes for. There is so much choice and it’s pointless me tying you down to just one or two choices.
They all take just one of each gem, so I won’t bother listing all the mats as it’s pretty obvious.

355-360
Your stuck with trying to get world drop recipes here. The two most common drops are as follows:

Living Ruby Pendant (4 x Khorium Bars, 1 x Mercurial Adamantite, 1 x Living Ruby) x 5
or
Thick Felsteel Necklace (2 x Felsteel Bars, 3 x Mercurial Adamantite) x 5

The Thick Felsteel Necklace is obviously the most desirable to get, as it’s the cheapest to make. There are other recipes out there to fill this levelling gap, so if you happen to get one of those, use that instead.

360-365
The next bit requires being honoured with The Sha’tar:
Ring of Arcane Shielding (2 x Eternium Bars, 8 x Primal Mana) x 5
or
You could go and farm Vekh’nir Dreadhawk’s in Blade’s Edge Mountains and hope the following drops:
Khorium Band of Leaves (2 x Khorium Bars, 4 x Mercurial Adamantite, 3 x Primal Life) x 5

365-375
If your raiding Kharazan and you have a lot of Alchemist transmuting Diamonds, then use those to skill up the last 10 points. There’s a 60min CD on making each one, but it’s still fairly easy for a raid guild’s Jewelcrafting to finish skilling up on. Otherwise your stuck with using rare world drop recipes again.

365-370
Embrace of the Dawn (2 x Eternium Bars, 4 x Mercurial Adamantite, 2 x Golden Draenite) x 5
This seems to be the most common recipe on the AH. It’s not cheap, but if you don’t have anything else to skill up on, it’s your best choice.
There are a few other rare world drop recipes that need 365 skill. So if you get any of those, then use them instead.

370-375
Of all the recipes available at 370. Probably the easiest to make is probably Figurine - Felsteel Boar, but that requires Lower City revered rep. So I’ll list the next best ones in terms of rep.

Figurine - Talasite Owl (2 x Eternium Bars, 2 x Talasite, 4 x Primal Mana) x 5
Requires Sha’tar revered rep.
or
Figurine - Dawnstone Crab (4 x Khorium Bars, 2 x Dawnstones, 4 x Golden Draenite) x 5
Requires Honour Hold/Thrallmar revered rep