Believe it or not this is a real eggshell! It's been emptied, painted and encased in at least 20 coats of high gloss lacquer to keep it strong! DIL gave it to us for an Easter present. It is so fragile that if dropped would disintegrate!
I decorated an egg this way a LONG!!! time ago. It withstood the test of time for many years- but I honestly don't remember what happened to it. This is beautiful and your daughter-in-law did a lovely job in decorating it.