A Sapphire Star is an object that appears in Wario: Master of Disguise.
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Sapphire Stars are small, glowing star blocks that can be found throughout levels in the game. These stars can only be activated by shooting at them using Cosmic Wario's lasers. Doing so will cause some coins and gems to be produced until the Sapphire Stars stop glowing. Once they do, they cannot be shot at again.
According to Goodstyle, Wario can pace himself between shots in order to produce more coins and gems to collect.