Arms. Quarterly:  1st and 4th, Or a Fess checky Azure and Argent within a double Tressure flory counterflory Gules (Stuart);  2nd and 3rd, Argent a Lion rampant Azure armed and langued Gules (Crichton);  behind the shield are placed in saltire a Key Or having within its handle a Fess checky Azure and Argent, and a Rod Gules surmounted of a Tower Argent masoned Sable conically capped loopholes and port Gules (Insignia of Office of Hereditary Keeper of Rothesay Castle).

Crest. 1st:  a Dragon Vert crowned with an open Crown of four Strawberry Leaves langued Or (Crichton);  2nd:  a demi Lion rampant Gules armed and langued Azure (Stuart);  3rd, a Wyvern proper holding in the mouth a Sinister Hand couped Gules (for the Lordship and Fief of Cardiff).

Supporters. Dexter:  a Stag proper attired Or gorged with an Earl's Coronet also proper having therefrom a Chain reflexed over the back Gules;  Sinister: a Horse Argent bridled Gules.

Motto. Avito Viret Honore (He flourishes in an honourable ancestry).

• Cracroft's Peerage

Baronet badge as at Castle Stuart (Bute) :

• https://www.flickr.com/photos/buzztrips/12176922175
• https://www.flickr.com/photos/fal2008/2841887817/