Diamonds are an important element in the game that you need not only the start of the game. In each city, with a pub, you can choose to buy beer for someone. There are always three people here. Select ten gold, it always worked for me best. The man tells you something. At best case offer you something for sale - map. It's definitely a good buy. It costs around 50 gold. But is not so good to start the game like this

Once you have map is looking for diamonds better. Not easier, but better. If you success you can get lot of diamonds. Number of diamonds is randomized, in part depends on the number of people hired.

Go to the mine (or castle ruins) and chose search. There is 6 mines or ruins, one on every island and 3 on continent.

Here are the possible results.

And why are diamond so important? You can change them for gold. Minimum is 50 gold for 1 diamond. Maximum can be up to 150 for 1 piece (i find 150 and it can be maximum.) The price of diamond is bound to price of everything else. When the prices are high, its your time to exchange.

The task is clear. Buy low, sell high.
I hope it will help you.

Here is the lowest prices i ever met.
And on the right is the lowest prices with N/A. Sell nothing when you have N/A, it's always lowest price for selling.

There is evidence that i am not invent these prices, you really can sell even at that price.
I believe that after a long playing the game prices still rising. This also explains this

• Sea Dog. Tame the waves of all of the seas.
  
• Nothing hard, just sail the seas.

• Pious. Help the monks of Lackov.
  
• Few quests in one, he wants go there and somewhere else and back...

• A Small Army.
  
• Hire 30 companions.
  
• Again nothing hard, you can complete it nearly after start new game. Just hire them and then fire them.

• 
• Enlightened Mind. Gain Losidofian engineers recognition.
  
• Few quests about scholars.
  

• A Brave Heart.
  
• Prove your bravery and become a knight.
  
• Belongs to soldiers quests, but i don't know exactly.

• Explorer. Penetrate the mines of the Kingdom.
  
• Don't know, don't have.

• Big Gun. Earn 150000 gold in one transaction.
  
• Not much to say.
  

• Helper of Humanity. Complete all side quests.
  
• I recommending first do some cash and then just travel and sometimes buy and sell. Just complete them and hope the achievement will come. I complete it and still don't have it.

• Jewel Eye. Explore the mines and ruins.
  
• Just do it, but same as "Helper of Humanity" achievement, this one is bugged.

• Quick Trade. Gain 1000000 gold before the 1500th day.
  
• I don't have any advice here, you just must be very quick.
  

• Traveller. Roam the roads of Asavala.
  
• Still don't have. Really don't know what else i must do.
  

• Persistence. Play for 5 consecutive days.
  
• ....

• Extra Persistence. Play for 10 consecutive days.
  
• ...

Progress quests, depends on wealth:

• An Honest Man.
  
• Gain Spive’s Thieves Guild recognition.

• Keys to the Town. Earn Murrevorra’s honorary citizenship.

• Trade Council. Earn the title Head of the Trade Council.

1. When you are attacked by bandits, it does not mean that you are attacked once again next turn. My record is 2 times, once nothing and then 3 times.
   
   
2. When you search the mine and you are successful and then you go right to the next mine, you find nothing. For example Ragu Dos and Naru Sen.
   
   
3. There are no bandits on the sea. Just time penalty from octopus etc ...
   
   
4. Diamonds cannot be stolen.
   
   
5. You will not find food for the minimum and maximum for spices. All prices are moving together.
   
   
6. Game is broken, save doesn't work. I save only once and then i have luck sometimes and successfully rewrite it. But I would not count with it.
   
   
7. I tried to travel with a minimum business (3x) for 2000 days (it can be more). Enough for me to perform tasks look for diamonds and then sell at the maximum price. If you want to try: don't hire more guys, not even buy a cart, travel only.
   
   
8. My experience is that when I managed a good deal, I was robbed immediately.
   
   
9. Prices are moving still, hardly ever stagnates. Still watch them.

This is not the final version of the manual, I plan to continue working on it. I hope that yours ideas and insights from the game will help me finish it.
I welcome correction of my grammar too, because i know that i am not so good. ;)
Thanks.