Multi-colored sapphire, diamond and enamel clip-brooch, René Boivin, circa 1930

Of stepped motif and arched form, set with a row of 6 cushion-shaped sapphires in various colors, bordered by bands of old European-cut diamonds weighing approximately 1.50 carats, further accented with black enamel, the sides inset with segments of rock crystal, mounted in platinum, signed R. Boivin, Paris. 

Sylvie Raulet, Art Deco Jewelry, p. 131.