Art Deco brooch in platinum, lapis lazuli and diamonds

Art Deco brooch made in platinum. Signed Ruys Rambouse. Geometric design with a central hexagon, crowned by a diamond, bordered by a first band of lapis lazuli, and a second double band of diamonds, old cut, set in chaton. On the sides two rectangular lapis lazuli plaques, surmounted by a diamond, old cut, and bordered by a band of diamonds, old cut and three more in the left and right corners.
Weight:
Measurements: 5.4 x 2.2 cm.