キャサリン（ケンブリッジ公爵夫人）のインスタグラム(hrhtheduchessofcambridge) - 5月8日 13時40分

Not clearly seen in the picture but Why does Duchess Kate wear three rings?
One is her engagement ring
The other a wedding band
The third band is an eternity ring, a customary British piece that's given by Prince William upon the birth of their first child.
William doesn't wear a wedding band because of his military duties, I hear.

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