Diamond Chest
From CIFI - Cell: Idle Factory Incremental Wiki
Diamond Chests are one of the many sources of 
Diamonds in CIFI.
They can be opened every 400 seconds, granting 6 Diamonds and 30 seconds worth of 
Cells per 
Tick (both can be upgraded in Token Shop).
100 Diamond Chests can be opened everyday. The limit resets on the next daily cycle.
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