A pair of Art Deco diamond clip brooches, by Cartier. Photo Christie's Image Ltd 2013

Each of shield-shape set with lines of brilliant, square and baguette-cut diamonds, centering upon a larger square-cut diamond, to the pavé-set stylized bow surmount with baguette-cut diamond line detail, 1938, 5.0 cm each, with French assay marks for platinum, in red leather Cartier case. Both with maker’s mark and signed Cartier, no. 607. Estimate:  $129,465 – $161,831

Christie's. MAGNIFICENT JEWELS. 15 May 2013. Geneva. www.christies.com