can someone tell me what is the efficient way to get diamond?

[Kotohiro]

i already figure it out that u can get the diamond by trader. but where are the other options?

[jiamdead]

In the labyrinth, so is gold and gold bars.

[nekoraba]

Diamonds are not mined as ores, but are obtained from treasure chests. Head to the Underground Ruins from the ruins in the center of the map, and you will likely find them in a treasure chest below the 6th floor, but this is not guaranteed.
Once you have cleared all the floors and returned to the surface, you will be able to start directly from the 6th floor, so aim for that first.
I won't tell you how to get there as it would be a spoiler, but it should be easy to figure out if you have progressed through the story events.

[clockwalker]

Buy from trader seems the most efficient for me, since farming raids are less time consuming then wandering in ruins, however running ruins can grant you more unique treasures so it's still a valid option.

[nekoraba]

İlk olarak clockwalker tarafından gönderildi:

Buy from trader seems the most efficient for me, since farming raids are less time consuming then wandering in ruins, however running ruins can grant you more unique treasures so it's still a valid option.

If you only need the bare minimum of diamonds, you can use the traders, and when you run out of things to do, you can go to the underground ruins to get rare drops. I agree with you.

[Galenmereth]

Ruins also have other really good drops like the cores from the 5th level boss. Which you can repeat without exiting by walking back to the stairs you came down on, and clicking "Retry level" :D