Bianca Solderini

headcanon time

Remember The Egg? The easter egg Armand got from his mother in Kiev?

The painted egg he keeps thinking about even when he is already master of his coven in Paris and that has such strong metaphoric connotations in his book? We are told he kept it in his coffin in Venice

And we are told it was still there before he was taken away from Venice and he wonders what was of it in his frantic dreams.

Anyway, let's move now to Blood and Gold. After Bianca's turning, the very same night after the burning, she is sleeping in Amadeo's coffin

Okay, we are not told exactly that it is his coffin but Marius is using his and I doubt he had more around

And then a few nights later they leave Venice to go to TWMBK shrine in the Alps, and she is carrying a bundle of things with her.

And she carries this bundle into the shrine

So what I'm saying here is it's only logical to conclude Bianca must have found the egg in Armand's coffin and it would've been easy for her to understand this was a precious possession for him (given he kept it in his very coffin) and thus there is no reason to believe she wouldn't have kept it with her and taken it to the shrine and then to Dresden and so forth.

And I'm not sure if those eggs can survive 500 years in good condition, but if by any means they can, it is entirely possible that Bianca kept the egg and still has it today.