History of Famous Jewels and Collections: Re: A 75 carat Romanov emerald but who did it belong to?

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Sold in 1971, the description in the catalogue describes it as belonging to Tsar Alexander II which doesn't really address what happened to it after his death, had it remained in the main line surely it would have referenced Nicholas II? So presumably it passed to one of Tsar Alexander's younger children, including his illegitimate branch.

Any ideas?

It belonged to GD Vladimir and then to one of his sons (Boris if I am not wrong). After GD Vladimir's death it was sold and ended up in the Rockefeller family. It resurfaced a few years ago at Christie's.