The two main devices (symbols) in the Peace blazon are the dove and olive branch. The two main tinctures (colors) are vert and argent.
The deep green colour that is so often observed in heraldry is more properly known as vert. According to Wade, the use of this colour signifies “Hope and Joy”, but may also represent, rather delightfully, “Loyalty in Love” 1The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P36. It has other names also, the French call it sinople, perhaps after a town in Asia Minor from where the best green die materials could be found 2A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Vert. More fanciful heralds liked to associate it with the planet venus and the precious stone emerald 3Boutell’s Heraldry, J.P. Brooke-Little, Warne, (revised Edition) London 1970, P 27. More strangely, there is some evidence that the term prasin was anciently used, being the Greek for the vegetable we call the Leek!
Argent is the heraldic metal Silver and is usually shown as very pure white. It is also known more poetically as pearl, moon (or luna) 4Understanding Signs & Symbols – Heraldry, S. Oliver & G. Croton, Quantum, London, 2013, P53. In a sketch or drawing it is represented by plain, unmarked paper 5A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1847, P11.
Birds of great variety occur throughout heraldry, at least in name 6A Complete Guide to Heraldry, A.C. Fox-Davies, Bonanza (re-print of 1909 Edition), New York, 1978, P233. In truth, despite the proliferation of species, the actual depictions can sometimes be hard to distinguish! The dove is an example of this, closely related birds such as pigeon and stock dove are frequently mentioned in arms but visually almost identical. 7A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Dove The dove itself is said to represent “loving constancy and peace” 8The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P80, the other birds possibly some play on words with the family name (PIDGEON for example).
The olive branch should not surprise as in being regarded as the emblem of “ peace and concord”, from its biblical significance in the story of Noah and the Dove returning to the ark. 9The Symbolisms of Heraldry, W. Cecil Wade, George Redway, London, 1898 P129. Indeed we often find the olive branch depicted on a shield being carried by a dove. 10A Glossary of Terms used in British Heraldry, J.H. Parker, Oxford, 1894, Entry:Olive-tree