So I know there have been many theories about how Pink Diamond is Rose and all that. And also there are many people who said this could not be because Rose shattered Pink Diamond. But lets consider the shape of Pink Diamond's and Rose's gems.
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Notice how Pink Diamond's gem does not have the same front facing facet as the other Diamonds we have seen. It is turned upside down and we don't see the top facet. However, we do see the side facets, which suggest one thing: Pink Diamond's front facing facet is not a diamond, but something else like a pentagon. It could also explain why our specific Rose has the same gem placement and how the Rose Quartzes became Pink's in the first place.
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