The first table explains how many soulstones grade 1 you need to get 1 soulstone of destination grade, e.g. 108 grade 1 soulstones to synthesize 1 soulstone grade 5.
The second table shows the needed grade 5 soulstones, if you prefer buying them, but its more expensive and you get less exp and sp.
The third table explaines the money you need for 1 Soulstone of the named grade, when you use grade 1 soulstones to synthesize.
The fourth and last table shows you how much exp you will get, when you produce one soulstone of the desired grade using grade 1 soulstones.
Needed Soulstones Grade 1: 530 gold
1: 1 = 1
2: 3 = 3
3: 3 = 9
4: 3 = 27
5: 4 = 108
6: 4 = 432
7: 4 = 1728
8: 5 = 8640
9: 5 = 43200
10: 5 = 216000
11: 6 = 1296000
12: 6 = 7776000
Alternatively:
Needed Soulstones Grade 5: 60000 gold
5: 1 = 1
6: 4 = 4
7: 4 = 16
8: 4 = 64
9: 5 = 320
10: 5 = 1600
11: 6 = 9600
12: 6 = 57600
Soulstone - gold:
1: 530
2: 1590
3: 4770
4: 14310
5: 57240 (60000)
6: 228960 (240000)
7: 915840 (960000)
8: 4579200 (4800000)
9: 22896000 (24000000) = 24mil
10: 114480000 (120000000) = 120mil
11: 686880000 (720000000) = 720mil
12: 4121280000 (4320000000) = 4320mil
Soulstone - exp:
1: 0
2: 6
3: 3*6+6 = 24
4: 3*24+6 = 78
5: 4*78+6 = 318
6: 4*318+6 = 1278
7: 4*1278+6 = 5118
8: 5*5118+6 = 25596
9: 5*25596+6 = 127986
10: 5*127986+7 = 639936
11: 6*639936+6 = 3839622
12: 23037738 = 23 mil exp
Skillpoints = exp/3