Ever wonder what would be considered the most valuable items in OP? After doing few research I came upon this list of items that would worth fortunes.
1. Road Poneglyph
The most important type of poneglyph, which holds the key to find One Piece and also the location of Laugh Tale where the treasure lies. They have distinctive color of red.
Quantity: 4
2. Rio Poneglyph
These poneglyph holds the information on the Void Century and the location of the 3 Ancient Weapons, which is strictly forbidden by the World Gov.
Quantity: 9
3. Mythical Zoan Devil Fruits
The rarest type of df among the df category. Which often comes with mythical powers that Zoan df users lacks and rivals the power of Logia users. Allows user to transform into mythical creatures.
Known quantity: 7
4. Ope Ope no Mi (Op-Op Fruit)
Said to be the 'Ultimate Devil Fruit'. The most powerful of df in the Paramecia class of df. Allows the user of the fruit to grant immortality to another person, in the cost of own life.
Estimated value: ฿ 5,000,000,000
5. Logia Devil Fruits
Strongest/rarest class of df among the 3 types of df. Allows the user to transform into one of the natural elements.
Known quantity: 11
6. Black Blade
The toughest and the highest quality of blade/swords one can weild. Imbued with permanent Armament haki, only the highest caliber of swordsman can weild it.
Known quantity: 2
7. Supreme Grade Swords
Highest graded swords, which is said to posses top tier durability and sharpness. Only the most legendary of pirates have been shown to weild it. Mihawk/Gol D. Roger/Whitebeard
Quantity: 12
8. Devil Fruits Average
The staple of power system in One Piece like Haki. There general rarity makes them highly sought after items by the 3 great powers.
Estimated value: ฿ 100,000,000 (Prices may vary by the abilities and types)
9. Adam Woods
Considered to be the strongest type of wood. The wood itself comes from the Treasure Tree Adam, which its origin is still unknown. Oro Jackson and Thousand Sunny are the only known ships to be made from Adam Woods.
Estimated value: ฿ 200,000,000
10. Sea Prism Stone
Originating from the land of Wano, it's one of the only few ways to negate the power of devil fruit. It's said to be hard as diamond and holds the power of the ocean. It's properties were first discovered by Dr. Vegapunk.
I've tagged all the above items down below if you're interested in them or if you want to know more about them. Btw I didn't copy paste the above list just in case if you're wondering.😄