Platinum was the favoured metal of the Edwardian and Art Nouveau periods because it lent itself especially well to delicate designs like this one.
This pretty pin is being offered by Etsy seller Best Old Jewelry. They have this to say about it: ‘Platinum on 18k gold, diamonds, opal and rubies. Made in France circa 1890-1910. Measurements: approx. 2 3/4 inches long; weighs 10.5 grams. Exquisite Art Nouveau design – long, narrow, waving bands of diamonds, intertwining with whiplash twists and turns. The diamonds are set in platinum. The central section of the brooch represents a flower in bud with calyx and sepals all set in diamonds. The bud itself consists of a beautiful opal – navette in shape with wonderful translucent light, strong blue tones (not adequately reflected in the ‘photos) and good fire. The opal is offset by 5 Colette-set rubies that serve to emphasize, brighten and add to the strong colorful element. Workmanship is of the highest order as is every aspect of this beautiful brooch. The brooch comes with a period fitted box which might/not be original to the piece. It is marked inside with the name of ARTAULT & DUCLEROIR JOAILLIERS ORFEVRES MOULINS and the monogram B.A on the lid. The piece is hallmarked both on the side of the brooch and on the pin. Condition: good with negligible wear commensurate with age.”
This sells for USD$7,250.