How much is Diamond worth?
The physical Diamond fruit trades for around 1M. The permanent version is worth about 900M. In the shop it costs 600,000 Beli, or 1,000 Robux for the perm.
Demand for Diamond is 2 out of 10. That's low, so expect to wait, or add it as an extra in a bigger trade.
What can you get for Diamond?
Fruits with a similar value make a fair swap. The list below shows fruits close to Diamond in value. Use the trade calculator to check a full offer before you accept.