Royal Coat-of-Arms - Royal Exchange, London, UK - Coats of Arms on Waymarking.com

The Royal Arms are carved from Portland stone with the lion and unicorn being full 3D figures.

Wikipedia tells us about Queen Victoria's Royal Arms:

As Sovereign, Victoria used the royal coat of arms of the United Kingdom. Before her accession, she received no grant of arms. As she could not succeed to the throne of Hanover, her arms did not carry the Hanoverian symbols that were used by her immediate predecessors. Her arms have been borne by all of her successors on the throne.

Outside Scotland, the blazon for the shield—also used on the Royal Standard—is: Quarterly: I and IV, Gules, three lions passant guardant in pale Or (for England); II, Or, a lion rampant within a double tressure flory-counter-flory Gules (for Scotland); III, Azure, a harp Or stringed Argent (for Ireland). In Scotland, the first and fourth quarters are occupied by the Scottish lion, and the second by the English lions. The crests, mottoes, and supporters also differ in and outside Scotland.

Wikipedia also tells us about the Royal Arms thus:

Quarterly, first and fourth Gules three lions passant gardant in pale Or armed and langued Azure (for England), second quarter Or a lion rampant within a double tressure flory-counter-flory Gules (for Scotland), third quarter Azure a harp Or stringed Argent (for Ireland), the whole surrounded by the Garter; for a Crest, upon the Royal helm the imperial crown Proper, thereon a lion statant gardant Or imperially crowned Proper; Mantling Or and ermine; for Supporters, dexter a lion rampant gardant Or crowned as the Crest, sinister a unicorn Argent armed, crined and unguled Proper, gorged with a coronet Or composed of crosses patée and fleurs de lis a chain affixed thereto passing between the forelegs and reflexed over the back also Or. Motto 'Dieu et mon Droit' in the compartment below the shield, with the Union rose, shamrock and thistle engrafted on the same stem.