Art Deco Diamond Onyx Geometric Openwork Brooch Platinum 1920s/1930s French

Art Deco diamond and onyx geometric openwork brooch in platinum and white gold, French, 1920s/1930s. This jewel features an octagonal onyx horizontal plaque, each side accented with a geometric floral motif pave-set with 36 single-cut and rose-cut diamonds in platinum. It is designed in such a way that when worn, it seems to just float above the fabric. This brooch is secured to reverse with a hinged pin and barrel clasp fitting. Diamonds: 4 single-cut and 32 rose-cut; estimated 0.2ct total. Partial French hallmark for platinum; French hallmark for 18kt gold; marked “83989”, “28” and “89”; another indistinct mark. Dimensions: 4.6 x 2.3 cm. Gross weight: 6.79g. This item is in good condition, with marks and scratches consistent with general age and wear. Antique, period and vintage pieces, both signed and unsigned, are being offered as worn. Unless otherwise stated, all weights and quality factors have been graded as mounting permitted and using classic gemology and standard gemological equipment and might slightly differ from the assessments provided by other gemologists. Assessments related to period of manufacture or geographic origin of gemstones are expert opinions and may differ from the assessments provided by other professionals. Colors in the pictures/videos might slightly differ from the colors in real life. When certificated stones are being offered, the certificate or report will be mentioned. For additional information or clarification, please get in touch and our in-house team of expert GIA Graduate Gemologists and Registered Appraisers/Valuers will be happy to help.