Cartier Juste un Clou triple wrap ring, 18K yellow gold, set with 77 brilliant diamonds totaling 0.59 carats. This Cartier Nail ring was designed in the 1970’s to symbolize a person of independent nature who has a strong sense of self-belief. About Cartier Juste un Clou Collection: A nail becomes jewelry. Designed in 1970s New York, the first Cartier Juste un …