This unfinished egg was intended as an Easter gift for Tsar Nicholas II's wife, Alexandra Feodorovna. Planned as a celestial globe, the egg's primary material was to be blue glass. The two halves of the egg that still exist are engraved with the constellation of Leo, the zodiacal sign of Tsarevich Alexei, as well as other constellations. Documents indicate that the egg was meant to incorporate a rotating dial and possibly a clockwork mechanism within its interior. This would have transformed the egg into a functional astronomical timepiece, though the exact functionality remains unknown. The engraved constellations were to be adorned with diamonds, and the egg was to be supported by silver cherubs on billowing rock crystal clouds, with the entire piece resting on a nephrite pedestal. Documents also indicate that the cherubs and clouds were completed, but the egg and pedestal were not, as production ceased abruptly in 1917 due to political upheaval in Russia. Components of the egg remained hidden for decades before being rediscovered in 2001 at the Fersman Mineralogical Museum in Moscow, where they had been left in 1925 by Fabergé's son Agathon. These components consisted of the glass egg itself and the cloud base. The cherubs and unfinished pedestal were not among them. These pieces have been declared authentic by various Russian experts, but the Fabergé Museum in Baden-Baden claims to possess the original, nearly complete egg. It asserts that the cherubs were never completed. For those pieces, see here.