I'm not really sure why I thought of Fabergé eggs in conjunction with this thread, but then it came to me today that 10 years or so ago at Christmas, Coutts in The Strand covered the front of their windows with a Fabergé display of rings, necklaces and earrings inside snowflakes if I remember. It was clever and beautiful, but not as detailed as the Christmas window at Liberty on the corner of Regent Street which is always my favourite.
I think there are also some Fabergé items in the V & A Museum. I definitely remember some royal family pieces, but maybe not eggs?