Celestine is a pretty, crystalline extension (actually a diminutive) of Celeste that would make a choice that is both delicate and strong. It is commonly heard in France, where it currently ranks at Number 421.
Celestine was the name of painter Edgar Degas's Creole mother. Some people might associate it with the 1993 spiritual novel "The Celestine Prophecy."
Celestina is another attractive version.