it's such a pity as it's such a stunning piece that I'd love to see a picture of someone in that period of dress wearing it.

It must have belonged to such a private family if they won't even be backgrounded within the archives.

1914 is also an interesting period as it could have been a Russian family or also US. However I think that during the first world war was when the tiara really started to become less of a go to for the wealthy or newer wealth of the USA. So it may in have really never left the vault in the USA or the same in Russia only to be sold.

If it changed hand a few times I suspect it may have been acquired in same cases more because of it's design quality.