Beanstone

Beanstones are collectibles in Mario & Luigi: Superstar Saga and reappears in the remake. Beanstones only appear during the sidequest. When Bowletta invades the Beanbean Kingdom for the second time, the sidequest is unavailable.

Appearance
It is a blue gemstone tha flashes different colors. In Mario & Luigi: Superstar Saga + Bowser's Minions, it appears to flash in diffent colors but the Beanstone is green in the inventory.

History
At the Beanbean Castle Town, Fava's brother, the town's oldest intellect has a sidequest for Mario and Luigi to find him all of the ten Beanstones and he will reward them a Rock Badge.