Valenciennes lace is a Flanders lace, but of course, not all Flanders lace is Valenciennes. (ie All Ford sedans are cars, but not all cars are Fords!) Valenciennes lace is made on a lace pillow all in one piece, with the diamond-shaped net ground (reséau) being made at the same time as the pattern (tôile). It is identified via several factors - the openness of the diamond-shaped ground, the closeness and evenness of the tôile patterns, the lack of gimp or outlining threads, etc.
This is a short answer but there is much more to know!
Valenciennes Bobbin Lace | Flanders Bobbin Lace |