The State Emblem of Russian Empire since XV century had been a double-headed eagle. Its appearance changed lots of times and the last variant (1883) is the closest to the Russian Federation Emblem which is in force nowadays (with significant difference - there were emblems of provinces on the eagle's wings).
At the time of Provisional Government (from March till November of 1917) the Emblem had been a double-headed eagle without the symbols of royal power (now it is on the coins of 1, 2 and 5 rubles value). The State Emblem of Russian Soviet Federative Socialist Republic (picture of golden Sickle & Hummer crisscross, their shafts down, in the red background, in the sun rays, in the setting of ears, with the legend 'RSFSR' & 'Proletarians of all countries unite!', with the five-point star on the top of the Emblem) was accepted by the Constitution of RSFSR on the 10th of July, 1918, and came into force on the 19th of July, 1918; then it was described in the RSFSR Constitutions of 1937 and 1978 (the 'RSFSR' legend was changed to 'Russian Federation' by the amendments to the Constitution of the 21st of April, 1992).
In fact, since the 3rd of December, 1993 the Emblem (the golden double-headed eagle on the red shield, topped with three crowns, with the scepter and orb in its clutches, with the horseman striking the dragon, on the red shield on his breast), confirmed by the B.N. Yeltsin decree N 2050 of the 30th of November, 1993 (in the period of 'step-by-step constitutional reform'). The shield with the double eagle (in force since 1993) was confirmed by the federal constitutional law 'About State Emblem of Russian Federation' of the 27th of December, 2000; it was published and came into force on the 27th of December, 2000.