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 What will be the Onepiece Treasure ?

According to many theories and all it is expected that the One Piece Treasure is not just gold and diamonds. 

This treasure is Luffy's ultimate goal. According to the One Piece Fandom, not much is known about the One Piece, and we don't even know what it looks like. In Chapter 967 of the manga, it is referred to as a "treasure of unimaginable value," and there have been stories of its power that have travelled across the world in the series.

For the time being, all we know is that the One Piece was abandoned on Laugh Tale, the final island of the Grand Line. During the Void Century, someone with the title of Joy Boy left it there (about 900 years ago). This person is also unknown, most likely because Gorosei and the World Government have been suppressing information about him and his existence for years.

Nonetheless, we know Joy Boy was a prominent figure during the Void Century and played an important role in Fish-Man Island's history. He left a message all those years ago stating that he would return in 800 years.

Some of the possibilities are :

The Onepiece must be some legendary powers hidden or It might be some secrets or corruption that the world government didn't want to share to the public .

Also it can be a devil fruit which would be the strongest in the whole Onepiece .