Art Déco brooch with 31 sapphires, 3 old-cut diamonds and 4 diamond roses

Art Deco brooch with 31 sapphires, 3 old-european-cut diamonds and 4 rose-cut diamonds totalling ca. 0.08 ct, ca. WHITE -STW(H-J)/SI, 2 trapezoid-cut sapphires, 29 baguette-cut sapphires, 1 stone missing, 18K yellow gold, 4.2 g, faceside platinum, L: ca. 71 mm, W: ca. 1 - 6 mm, 1st half of the 20th century, good condition for its age.