This is part 1 of my divine divinity item guide, carefully compiled by myself, the first part is also titled "most knowledgable" items, meaning that most people know about most of these items, this is for people that need help getting something.
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The holy weapons:
Sword: In Iona's dungeon, click on the candle to open the path to the cave of illusions, where the sword lies.
Dagger: Join the thieves guild by speaking to Rob and completing his tasks, go down the nearby hatch and the door to the east will open, go to the central room and then to the northern room, which is Robs room, look at the book on the table and the dagger will be in there.
Amulet: In dark forest, go east when you enter and find a cave (or a platform if you don't like to fight ghosts) the amulet will be in a web near the exit.
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The Larian armour: When you find it in the stalkers lair, it is an ordinary breastplate at first glance, but when you find the easteregg area and kill the bad beetles and speak to Sven, it will improve. To do so, follow these steps.
1: Find all the treasure maps and go to treasure cave (go west at the dark forest entrance and continue down, when you find a small inlet search carefully, the cave is somewhere in one of the inlets) when you find a hidden room north of the treasure room, (there is a gravestone there) have these items.
1: 1 teleporter stone (1 in your inventory, 1 anywhere else)
2: 2002 gold, EXACATLY 2002 gold (hold down ctrl whilst dragging the gold out, drop 2002 gold and then drop the rest, then pick up the 2002 gold)
3: 5 bottles of Ale from Rimmer (speak to his brother in dwarven halls and then go back and forth a bit, he will eventually give you the 5 bottles)
4: The armour from the stalkers cave
5: The 4 ropes near the teleporter near the gravestone, NO OTHER ROPES
When you have these, click on the teleporter, when you enter the easteregg area you will find loads of prison cells, open them and then drop the ropes in them so you can enter them, when you find Sven go north and down another prison cell, beat the beetles and then speak to Sven, he will change the armour from the stalkers cave into the Larian armour!
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Dragon armour: When you retrieve the axe of stone and/or given the king the letter about his brother, the king will tell you about the dragon armour, here are the locations.
Gloves: In a funeral pyre in the elven burial grounds
belt: In an abandoned house in verdistis to the west, near where the 2 women are arguing, pick up the key on the shelf and then go down (you might fall down) enter a nearby room and use the key to open the chest, in there will be some gold and the belt!
Shield: In stormfist castle locked armoury, the key is in the study opposite the armoury
Breastplate: Get it from sir Patrick after you learn about the dragon armour from the king of dwarven halls, you will have to do something for him first though...
Heart: In the imps castle, this is connected to the warriors guild second test
Helmet: Get it from the king when you get the heart and the breastplate.
When you get the breastplate and the heart, speak to Grischa and he will combine them! It will take time though. Your reward will be worth it when you equip all the pieces though.
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Treasure maps: You have to find one of the maps to learn about the quest, here are the locations, there are 4 maps all together.
1: In the spiders cave north of archers guild
2: In a locked room next to dwarven mines in dwarven halls
3: Search a corpse in the rooms below assasins guild (these rooms can be reached from the assasins guild or the sewers of Verdistis
4: From Mpenzak when you get 1 map
When you find all the pieces go to treasure cave, which is in dark forest, search carefully around the mountain and you will find it.
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Optional amulets: Here are a few optional amulets found in the game
Amulet of glory: In the chamvber of the giant spider in the 5th level of the catacombs
Strange amulet Mardec: Look carefully in the corner of the engineers room in the cursed abbey
Dark elf amulet: In dwarven forest, you will find it on a skeleton
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Optional weapons: Here are a few optional weapons found in the game
Harpoon of Atlantos: Kill Shrimpo in the graveyard
Sword of the gods: In an abandoned house in the wastelands
Axe of 100 crusades: You get it off an imp in the wastelands, I found it everytime I played, so it isn't a random weapon
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That is my Divine divinity item guide, I hope it helps.
If I have made any mistakes, please quote it, I will correct the problem.