Please note: I made this list by hand, in 2005. The prices have probably changed quite a bit! But the basic "profitable/not profitable", have likely not changed much.

You probably will want to check out http://www.ffxiah.com instead.

The cost is either the average price of a single item in the auction house, (San D'oria)or the cost at a guild shop (blacksmith or goldsmith)

ItemCrystalIngr1Ingr2Ingr3Ingr4 Profit
Ametrine Ring
5000
Earth Crystal
50
Mythril Ring
5000
Ametrine
3000


-3050
Bastokan Harness
4500
Earth Crystal
50
Legionnaires Harness
3250
Brass Sheet
1000


200
Bastokan Knuckles
4000
Fire Crystal
200
Brass Ingot
650
Legionnaires Knuckles
2000


1150
Bastokan Leggings
5000
Earth Crystal
50
Legionnaires Leggings
3000
Brass Sheet
1000


950
Bastokan Mittens
4000
Fire Crystal
200
Brass Ingot
650
Legionnaires Mittens
2800


350
Bastokan Scythe
7500
Fire Crystal
200
Brass Ingot
650
Legionnaires Scythe
5000


1650
Black Ring
6000
Earth Crystal
50
Mythril Ring
5000
Black Pearl
1700


-750
Brass Axe
1600
Fire Crystal
200
Bronze Axe
600
Brass Ingot
650


150
Brass Dagger
900
Fire Crystal
200
Brass Ingot
650
Bronze Dagger
200


-150
Brass Hairpin
400
Fire Crystal
200
Brass Ingot
650



-450
Brass Ingot
650
Fire Crystal
200
Zinc Ore
400
Copper Ore
25
Copper Ore
25
Copper Ore
25
-25
Brass Mask
1000
Earth Crystal
50
Dhalmel Leather
1200
Brass Sheet
1000
Faceguard
500

-1750
Brass Ring
500
Fire Crystal
200
Brass Ingot
650
Brass Ingot
650


-1000
Brass Rod
500
Fire Crystal
200
Brass Ingot
650
Bronze Rod
500


-850
Brass Scales
250
Wind Crystal
200
Brass Ingot
650



-600
Brass Sheet
1000
Fire Crystal
200
Brass Ingot
650



150
Brass Subligar
400
Earth Crystal
50
Bronze Subligar
3000
Brass Ingot
650


-3300
Brass Subligar
400
Earth Crystal
50
Bronze Subligar
3000
Brass Sheet
1000


-3650
Bronze Bolt Heads
200
Wind Crystal
200
Bronze Ingot
500



-500
Bronze Ingot
500
Fire Crystal
200
Tin Ore
30
Copper Ore
25
Copper Ore
25
Copper Ore
25
195
Bronze Mace
350
Fire Crystal
200
Bronze Ingot
500
Bronze Ingot
500
Bronze Ingot
500

-1350
Bronze Rod
500
Fire Crystal
200
Bronze Ingot
500
Bronze Ingot
500
Copper Ingot
400

-1100
Bronze Scales
250
Wind Crystal
200
Bronze Ingot
500



-450
Bronze Sword
650
Fire Crystal
200
Sheep Leather
800
Bronze Ingot
500
Bronze Ingot
500

-1350
Chain Belt
15000
Earth Crystal
50
Silver chain
4000
Silver chain
4000
Silver chain
4000
Silver Ingot
2000
950
Circlet
100
Fire Crystal
200
Copper Ingot
400
Brass Ingot
650


-1150
Copper Hairpin
300
Wind Crystal
200
Copper Ingot
400



-300
Copper Ingot
400
Fire Crystal
200
Copper Ore
25
Copper Ore
25
Copper Ore
25
Copper Ore
25
100
Copper Ring
100
Fire Crystal
200
Copper Ingot
400
Copper Ingot
400


-900
Garnet Ring
2000
Earth Crystal
50
Mythril Ring
5000
Garnet
11000


-14050
Goshenite Ring
3500
Earth Crystal
50
Mythril Ring
5000
Goshenite
9000


-10550
Hiraishin
1333
Fire Crystal
200
Copper Ingot
400
Silver Ingot
2000


-1267
Mythril Ring
5000
Fire Crystal
200
Mythril Ingot
6500
Mythril Ingot
6500


-8200
Opal Earring
3000
Earth Crystal
50
Silver Earring
2000
Light Opal
1000


-50
Pearl Ring
3000
Earth Crystal
50
Mythril Ring
5000
Pearl
4000


-6050
Peridot Ring
5000
Earth Crystal
50
Mythril Ring
5000
Peridot
5500


-5550
San dOrian Sword
6000
Fire Crystal
200
Royal Archers Sword
2000
Brass Ingot
650


3150
Sapara
1400
Fire Crystal
200
Brass Ingot
650
Brass Ingot
650
Silver Ingot
2000

-2100
Silver Arrowhead6
2000
Wind Crystal
200
Copper Ingot
400
Silver Ingot
2000


-600
Silver Belt
7000
Earth Crystal
50
Lizard Belt
2500
Silver Ingot
2000


2450
Silver chain
4000
Earth Crystal
50
Silver Ingot
2000
Silver Ingot
2000


-50
Silver Earing
Wind Crystal
200
Silver Ingot
2000
Silver Ingot
2000


-4200
Silver Hairpin
1500
Wind Crystal
200
Silver Ingot
2000



-700
Silver Ingot
2000
Fire Crystal
200
Silver Ore
300
Silver Ore
300
Silver Ore
300
Silver Ore
300
600
Silver ring
1700
Fire Crystal
200
Silver Ingot
2000
Silver Ingot
2000


-2500
Sphene Ring
4000
Earth Crystal
50
Mythril Ring
5000
Sphene
3000


-4050
Tin Ingot
450
Fire Crystal
200
Tin Ore
30
Tin Ore
30
Tin Ore
30
Tin Ore
30
130
Turquoise Ring
10000
Earth Crystal
50
Mythril Ring
5000
Turquoise
9000


-4050

NOTES