Crystal production

Here is what you need to create crystals by Crystallisation.

• Buy everything in Giran. The tax should be 10% less in another town to have the same NPC price or with the exception of the dwarven village, the tax difference should be 5% (i.e. if the tax in Giran is 12% and in Schuttgard is 6%, it is cheaper to buy in Dorfland, which belongs to the Schuttgard castle).
  

• For D and C grade crystals buy any normal item (weapon,jewel,armor) from the NPC and crystalise it. (check New Crystal Prices post). If you buy common items, some come out as cheaper; the best value is with the Common Item - Crafted Leather Gloves / Common Item - Leather Boots which give 2 D crystals at 534 each and the Common Items - Karmian Gloves/Chain Gloves/Boots of Seal/Chain Boots/Dwarven Chain Boots/Reinforced Mithril Gloves/Karmian Boots/Tempered Mithril Boots/Plate Leather Boots, which give 2 C crystals at 2700 adena each. The problem with common items is that if you need 1000 crystals, you have to buy and crystallise 500 items, in order to get the cheapest deal.
  

Now for B crystals, follow these instructions.
1) Buy 2 Tsurugi swords, at 4 Million each
2) Buy 41 Stone of Purity (SoP) from PC shops at around 10K each
3) Go to Aden BlackSmith, who will make the Tsurugi Duals for a 20K fee.
Total cost at around 8.43 Millions and crystalising the Tsurugi*Tsurugi will produce 891 B crystals for a final cost of around 9461 per crystal.

For A crystals, follow these instructions.
1) Buy 2 Keshanberk swords, at the Giran luxury shop for 579 B cry and 1737 C cry=~ 10.7 Million each for a total of 21.4M
2) Buy a Dual craftstamp from a PC shop at around 750K each now, or if you have access, buy it from a Fortress chamberlain or whichever NPC is selling them.
3) Go to the Mammon BlackSmith, who will make the Keshanberk duals for a hefty fee of
1953000 AA.
Now the market for Ancient Adena is blown out of proportion, but I will assume you set a Buy shop and got them at 4:1. So the BS fee would be about 8M.
Total cost at around 30.14 Millions and crystalising the Keshanberk*Keshanberk will produce 1128 B crystals for a final cost of around 26720 per crystal.
Apparently it is better to buy A crystals from PCs in Giran these days.