Below Quick Guide 
Rather than hinge (e.g. if you don't have metal working of 800) you can sell seals to crafters:
Emeralds sell for 1g
Sapphires sell for 3g
Diamonds sell for 10g
Albion : In alb, buy the 2H greatsword for 15 diamond seals. Salvages for 100 asterite bars.
Midgard : Infernal Caller cost 18 diamonds u get 120 asterite for em = about 225g
Hibernia : N/A
ITEM NAME/MATERIAL/SEALS/SALVAGE/NET BARS/PER SEAL
EMERALDS
maligned avernal hammer (asterite) 32 22 0.68750 1.53698
maligned avernal spiked axe (adamantium) 20 21 1.05000 1.56702 ***
SAPPHIRES
accursed avernal spiked axe (asterite) 21 47 2.23810 5.00349 ***
accursed avernal great hammer (asterite) 22 49 2.22727 4.97929
accursed avernal great sword (asterite) 24 53 2.20833 4.93695
accursed avernal great axe (asterite) 27 60 2.22222 4.96800
daemon crafted boots (asterite) 28 62 2.21429 4.95026
daemon crafted sleeves (asterite) 30 67 2.23333 4.99284
daemon crafted helm (asterite) 30 67 2.23333 4.99284
daemon forged sleeves (asterite) 30 67 2.23333 4.99284
daemon forged leggings (asterite) 32 71 2.21875 4.96024
accursed avernal caller (asterite) 34 75 2.20588 4.93147
accursed avernal sword (asterite) 34 75 2.20588 4.93147
DIAMONDS
infernal caller (asterite) 18 120 6.66667 14.90400 ***
Emeralds:
(item name (seal cost), salvage amount)
- Avernal Hauberk (26), 26 Adam.
- Avernal Leggings (26), 26 Adam.
- Avernal Sleeves (25), 25 Adam.
- Tainted Fiend-Forged Hauberk (26), 26 Adam.
- Corrupt Fiend-Forged Hauberk (26), 26 Adam.
- Maligned Avernal Great Hammer (21), 22 Adam.
- Maligned Avernal Hammer (32), 22 Aster.
Sapphires:
- Accursed Avernal Sword (34), 75 Aster.
- Accursed Avernal Caller(34), 75 Aster.
- Daemon-crafted sleeves (30), 67 Aster
- Daemon-crafted helm (30), 67 Aster
- Dameon-forged sleeves (30), 67 Aster
Diamonds:
- Abysmal Sleeves (20), 133 Aster.
- Abysmal Helm (20), 133 Aster.
- Abymal Hauberk (22), 146 Aster.
- Infernal Soul Blade (19), 126 Aster.
