The present design was matriculated by the Lord Lyon in 1920. The description reads: 'Sable, a castle triple towered and embattled argent, masoned of the first, windows and doors open gules set upon a rock proper. Above the shield is placed a helmet befitting its degree with a mantling sable doubled argent and in a scroll over the same this motto "Musis Respublica Floret" (The State Flourishes with the Muses).' The W.C.A. Ross memorial crest displaying the school arms was unveiled at the main entrance at Barnton in 1973.