The Fabergé egg was supposed to be an interpretation of an egg from the early 18th century, three copies of which are still known today. They are located: in Rosenborg Castle in Copenhagen, in the Kunsthistorische Museum in Vienna, and in private collections in Dresden.
Inside all these eggs there is a chicken hidden, and when you open it, you can find a crown and a ring inside it.
Fabergé was inspired by an egg from Rosenborg Castle in Copenhagen and it was a nod to the tsar's wife, Maria Feodorovna, because she was of Danish origin, and the precious gift was supposed to remind her of the country she came from and where she spent Easter.