Beth, last year you've
posted a photo of Mary Innes-Kerr, Duchess of Roxburghe (née Goelet) at a fancy dress ball in 1912, wearing a necklace which looks like the wedding tiara of Helia Walker. Maybe Mary Goelet was the necklace/tiara's first owner and it was purchased by the Walker family after her death in 1937.
A somewhat clearer photo here.