The phrase "belle tournure" is a French term that translates to "beautiful turn of phrase" in English. It is commonly used to describe writing that is eloquent and well-crafted. Some synonyms for this phrase include "well-turned," "artfully phrased," "elegantly expressed," and "graceful in expression." These words all convey a similar idea of writing that is refined, polished, and pleasing to the ear or eye. Other synonyms might include "stylishly stated," "skillfully articulated," and "beautifully worded." Ultimately, any phrase that suggests a level of artistry in language could be considered a synonym for "belle tournure".