Invalidating a patent that has already been granted

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Is this prior art for “Reiki ornament” (US D663234 S1)?

I came across this design patent in Google: "Reiki ornament" (US D663234 S1) And I realized it describes a design that is very similar to this artifact, which is on display at a Tibetan museum. Can ...
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Patent Invalidation in part or totally

If a Patent claims more than one "Item", say Item A, Item B, Item C etc... and if it can be proved that say Item A, has been offered and sold to a commercial entity, can the Patent be invalidated in ...