Might also want to check out
Stitched Flesh Cloak ( back )
Stonewall Pauldrons ( Shoulder )
Black Steel Wrap ( waist )
Dwerium Jewelry for ears / fingers and possibly bracers are also pretty impressive with the right stones in them.
At 68 with Dwerium rings, ears and one bracer currently have with various Harmonagate cut stones, Round Cut Peridot and Opal - roughly 30 AC 20 to str dex sta or str dex agil, plus 350 hp 200 mana and 20 to a handfull of resists. You can fill face, neck, wrists, ears for a total of 8 slots with this sort of item, though given the price of some of the SoF drops and the additional benefits you get from them, you probably only want to pursue the player jewelry for slots you can't find a suitable alternative for.
The jewelry stuff was somewhat putzed a while back, the scaling for being under level was way out to lunch - they seem to have corrected it now though in that the various types of metals now have a level rec, and the quality of the metal impacts the % of the gem stats you actually benefit from - that said, here is some info on the various gems you can put into the trio jewelry items.
Gems and Stats
Staurolite
Augmentation type: 11 ( Only useable in JC Items )
AC +12, ( 1 Stat ) +14, HP/Mana/End +100, Sv D/M +14
Half-Moon Cut - Agi
Marquise Cut - Cha
Oval Cut - Wis
Pear Cut - Sta
Round Cut - Int
Square Cut - Str
Trilion Cut - Dex
Prestidigitase
Augmentation type: 11 ( Only useable in JC Items )
AC +14, ( 2 Stats ) +17, HP/Mana/End +150, Sv F/C +17
Half-Moon Cut - Dex, Agi
Marquise Cut - Cha, Agi
Oval Cut - Str, Wis
Pear Cut - Sta, Int
Round Cut - Wis, Int
Square Cut - Str, Sta
Trilion Cut - Dex, Sta
Hamonagate
Augmentation type: 11 ( Only useable in JC Items )
AC +17, ( 3 Stats ) +19, HP/Mana/End +200, Sv F/C/D/P/M +19
Half-Moon Cut - Str, Dex, Agi
Marquise Cut - Dex, Cha, Agi
Oval Cut - Str, Wis, Int
Pear Cut - Sta, Wis, Int
Round Cut - Cha, Wis, Int
Square Cut - Str, Sta, Cha
Trilion Cut - Dex, Sta, Agi
Taaffeite
Augmentation type: 11 ( Only useable in JC Items )
AC +19, ( 4 Stats ) +23, HP/Mana/End +250, Sv F/C/D/P/M +23
Half-Moon Cut - Str, Dex, Wis, Agi
Marquise Cut - Str, Dex, Cha, Agi
Oval Cut - Str, Dex, Wis, Int
Pear Cut - Sta, Cha, Wis, Int ( Yes the same as the Round Cut )
Round Cut - Sta, Cha, Wis, Int ( Yes the same as the Pear Cut )
Square Cut - Str, Sta, Cha, Agi
Trilion Cut - Dex, Sta, Int, Agi
Other Slot: Type 11 Gems:
Half Moon Cut Goshenite - Str/Sta/Wis +22
Marquise Cut Alexandrite - Str/Sta/Int +22
Marquise Cut Indigo Nihillite - AC +10, Mana +375
Marquise Cut Amber Nihilite - AC +10, End +375
Marquise Cut Crimson Nihilite - AC +10, HP +375
Oval Cut Fire Opal - Enduring Breath
Oval Cut Fire Emerald - Damage Shield +13
Oval Cut Demantoid - Str/Sta/Chr +22
Pear Cut Star Ruby - Faerune
Pear Cut Rubellite - Str/Sta/Int/Wis/Agi/Dex/Chr +12
Round Cut Morganite - Str/Sta/Agi +22
Round Cut Jacinth - Str/Dex/Sta +22
Square Cut Ruby - Mana Regen +7
Square Cut Black Sapphire - Sv M/F/C/P/D +14
Trilion Combine Star - Sv M/D/P +17
Trilion Cut Bloodstone - Heat Sight
Trilion Cut Amber - Ultravision
Trilion Cut Topaz - Shadow Sight
Trilion Cut Sapphire - HP Regen +7
Trilion Cut Shimmering Nihilite - HP/Mana/End +250 ( ? This may be wrong ? )
Trilion Cut Amethyst - Sv M/F/C +17
Type 10 Gems
Augmentation type: 10, 11 ( Only useable in JC Items )
Round Cut Malachite - SvPoison +14
Round Cut Hematite - SvFire +14
Round Cut Lapis Lazuli - SvDisease +14
Round Cut Cat's Eye Agate - SvMagic +14
Round Cut Turquoise - SvCold +14
Round Cut Onyx - Dex +12
Round Cut Jasper - Agi +12
Round Cut Carnelian - Str +12
Round Cut Star Rose Quartz - Chr +12
Round Cut Wolf's Eye Agate - Wis +12
Round Cut Jade - Int +12
Round Cut Peridot - AC +10
Round Cut Emerald - Mana/End +100
Round Cut Opal - Hp +100
Small Shaped ( Round Cut ) Pearl - Sta +12
( edit corrected the name on black steel wrap )