français term (edited): pierre appareill�e

or stone dressings,
stones worked to a finished face, whether smooth or moulded, and are used around an angle, window, doorway or other feature
Dictionary of Architecture

français term (edited): pierre appareill�e

appareillage - 1/ (As Dusty says) Manière de disposer les pierres ou les briques qui composent une maçonnerie. Dessin figurant la disposition des pierres ...

appareiller - Donner toutes les indications et mesures pour la taille et la disposition des pierres. Tailler et mettre en place les pierres suivant un assemblage déterminé. L'art d'appareiller les pierres - en particulier celles des voûtes et des arcs - est la stéréotomie (I'm glad I came!)
[Dicobat]

So far everyone has been right to at least some extent. It appears to be difficult to find an English equivalent, since ALL stone walls have to be "appareillé" to some extent, surely. The only reason I can see why they should specify "appareillé" is that in a such a carefully made stone wall, the stones are designed to be VISIBLE, i.e. not covered over with render.

So "exposed stone".

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Note added at 7 hrs 59 mins (2004-09-21 20:33:05 GMT)
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Forgot to say that Dicobat shows a number of appareillages in stone. They include \"opus incertum\" which is not exactly dressed stone!

opus incertum - composé d\'éléments de maçonnerie ou de dallage aux contours irréguliers, au gré de leurs formes et sans recherche d\'alignement de leurs joints
[Dicobat]

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Note added at 10 hrs 21 mins (2004-09-21 22:55:05 GMT)
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They are not necessarily PRECISE translations of your \"pierre apparente\" and \"pierre appareillée\", but you might want to consider \"random rubble\" (apparente) and \"coursed rubble\" (appareillée), even if the various stonework \"appareillages\" are not all coursed, strictu sensu, since you can include \"snecked rubble\" which might be said to be \"partially coursed\", hence neither randomly placed nor coursed. These terms (coursed and random rubble) will not be accurate under all circumstances, but might make the distinction required here. See your own (?) or someone else\'s question here re. \"moellon\" for more on \"rubble\" walls, which are not nearly so \"rubble\" as one might imagine.

français term (edited): pierre appareill�e

Got from grand dictionnaire

français term (edited): pierre appareill�e

Well, I may be wrong here, but from previous research I've done, I believe 'appareillage' referring to bricks (and presumably also stone!) means the overlapping 'bond' or pattern with which they are laid. Of course, on a stone building, this would clearly imply the use of dressed stone blocks, as distinct from the higgledy-piggledy arrangement of random stones often found in rustic buildings. But I think it is really referring to the way they are ARRANGED...

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Note added at 8 hrs 54 mins (2004-09-21 21:27:35 GMT)
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pierres apparentes

In my personal experience of estate agents\' house descriptions, they use this term to mean \'exposed stonework\', i.e. not rendered over, BUT it is almost invariably the random stuff (pretty!), as any other type of \'not covered-over\' stonework is called by another name --- pierre de taille / appareillée, etc.

so \'apparente\' implies both exposed AND random, whereas other options imply exposed AND neatly-arranged blocks

Good luck finding a succinct way of putting that in English!

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Note added at 20 hrs 50 mins (2004-09-22 09:23:39 GMT)
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Dylan:
I\'m not familiar with the term \'coursed stone\', but logically, for it to be laid neatly in \'courses\', I guess it would have to be neatly dressed first; HOWEVER, I HAVE seen certain buildings built with random stones, but where they had attempted to lay them in some kind of neat way; must be a nightmare!
But I think your term might well be best for Asker\'s purpose; why don\'t you post it as an answer?