FD GALLERY on Instagram: "Cartier’s monochrome jewels of the 1920s were a deliberately avant‑garde strand of Art Deco design that used stark black‑and‑white contrast—diamonds, platinum, onyx, rock crystal, and black enamel—to create graphic, modern jewels. The black‑and‑white idiom drew on earlier platinum‑and‑diamond “white” jewelry but sharpened it by inserting black—primarily onyx and enamel—to frame, outline, and visually “edit” the design, making negative space and line feel as important as