Agree it's a tortoise beetle. The one you showed has clear edges and dark black/brownish center. They are pests but not a serious one unless you have an outbreak. I just pick them off like @mahniah.
There is a related, slightly smaller tortoise beetle with liquid gold shell -- beautiful. I posted a photo of it once or twice before.
Even though they are also plant eating pests, I usually leave them alone. I just can't bring myself to destroy them.
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