Firstly, his Label is plain Argent (white). Secondly, as one step down from the Sovereign, the Heir Apparent to the UK Throne carries a Crown with one arch (usually, and as here, shown side on) as outlined in the previous Blog. Further particular embellishments include a representation of the Coat of Arms of the original native princes of Gwynedd, with quarters of gold and red with four counter-coloured lions, two badges representing the Heir's association with Wales (namely Three Ostrich Feathers and a Red Dragon) and the Shield of the Duchy of Cornwall. The Prince of Wales's motto is "Ich Dien" which is in fact German and not Welsh, and means "I Serve" being the Motto assumed by The Black Prince. This is a true mixture of Heraldry representing both rank and title.
The Prince of Wales does not use a representation of the actual modernistic Crown with which he was crowned/invested but uses a purely heraldic representation.
If you can bear with me for a paragraph or two, I will try to explain the complexity of the Heir's titles. An Heir Presumptive is the next in line to the Throne but is someone who could be replaced by someone with a better claim. This could, under the old system, simply have been an elder sister being replaced when her sibling came along who was a brother. This happened when HRH The Prince Albert Edward was born to HM Queen Victoria in 1841, replacing his elder sister HRH The Princess Victoria. Under the old system, the best such an Heiress Presumptive could hope for would be to be created Princess Royal as Princess Victoria was. The title Prince of Wales is restricted to the Heir Apparent and is bestowed not inherited. The present incumbent was created Prince of Wales in 1958, although he wasn't invested until 1969 when he was approaching 21 with a mini coronation at Caernarfon Castle. Again, under the old system, an Heir Apparent was the eldest surviving son of a monarch or, in the case of TM King Richard II and King George III, the eldest surviving son of the deceased eldest son of a monarch. (Second sons, as eldest surviving sons, can be created prince of Wales. such as TM King Henry VIII and King George V. HM King George VI was not created Prince of Wales because he was the brother not son of the monarch and was already Duke of York anyway.) Along with the title Prince of Wales comes the title Earl of Chester.
The Dukedom of Cornwall is not bestowed, it is inherited by the eldest surviving son of the monarch only. It was first bestowed on The Black Prince, son of HM King Edward III, and not only bestows land and property on the Heir, but also gives the incumbent a seat in the House of Lords. Although he was created Prince of Wales, the future King George III couldn't be created Duke of Cornwall as he was the grandson of the monarch, but the future King George V could.
With the introduction of the Succession to the Crown Act in 2013, we must contend with the possibility of a future Heir Apparent being female. This will mean the re-writing of all the above restrictions and qualifications, and the possibility of the above Coat of Arms being carried on a Lozenge. However, with the birth of HRH Prince George of Cambridge as the male eldest child of a male eldest child of a male eldest child, this will only possibly be of contention if Prince George's eldest child is a girl or, indeed, if George predeceases his sister. Therefore, based on previous enquiries of the College of Arms, this will not be legislated for until it is necessary so to do...
The Shield largely reflects the titles Great Steward of Scotland (I and IV Stewart) and Lord of the Isles (II and III) but with the Arms of Scotland (with the famous Double Tressure Flory-Counterflory) debruised by a Three-Pointed Label Azure (blue). Not surprisingly, the Shield is encircled by the Collar of the Order of the Thistle (instead of the Garter) and the Crest is that of Scotland with the blue Label (remarkable in that the Label is still blue on a red Lion). Surprisingly, though, both Supporters are Unicorns, instead of the United Kingdom supporters just swapped over. However, having said that, this Coat of Arms is purely Scottish and represents, along with the Banner of the Arms, The Duke of Rothesay in Scotland and not the heir to the UK Throne in Scotland. There is no evidence that HRH Prince Charles uses a Scottish version of the UK Arms with a plain white Label as the equivalent of what rest of his family does.
Probably the most famous badge associated with The Prince of Wales is that with three white Ostrich Feathers. Properly, they shouldn't be called The Prince of Wales's Feathers as they have nothing to do with the original native Princes of Wales. They should possibly more properly be called The Feathers of the Heir to the Throne as they were adopted by The Black Prince on a black background as a 'Shield of Peace'. Each individual feather had the motto "Ich Dien" which is German for "I Serve".
The feathers came from the family of The Black Prince's mother, Philippa of Hainault. One story goes that the Heir to the Counts of Hainault carried the title Count of Ostrevent and the badge was a pun on the Old French for ostrich which was ostruce. Alternatively, Philippa was also descended from the Counts of Luxembourg who used an ostrich as a badge.
Having said that, there were many badges going round with ostrich feathers. Even The Black Prince's father, HM King Edward III used one.
The story that the feathers and motto came from The Black Prince claimed them from having defeated blind King John of Bohemian at Crécy in 1346 has now largely been held to have no historical evidence to support it, even though it was first mentioned the year of The Black Prince's death in 1376.
The other Badges include the Shield and appropriate Crown of the original native princes of Gwynedd (Wales) as mentioned above, and of Cornwall. The other Badge is the Red Dragon of Wales with The Prince of Wales's plain white Label.
As the heraldry of HRH The Duke of Edinburgh may be looked on as reflecting his more pragmatic outlook on life, maybe the more flamboyant heraldry of HRH The Prince of Wales may be looked on to reflect his more romantic outlook.