Vintage, Art Deco style, black onyx and 4.14cts diamond handmade brooch. The brooch features one, 20 mm x 16 mm oval black onyx in centre and a total of sixty-nine diamonds in mixed cuts of reported total weight 4.14cts F - G colour, VS - SI clarity in an ornate, platinum frame with geometric and crescent shapes. Finished weight 17.20 grams. Overall size 55 mm x 33 mm. Gemmologist report (retail and market value / 2022)