Ostertag Brooches

Art Deco double clip brooch set with square, marquise, straight baguette and round diamonds weighing approximately 8 carats.

Platinum Art Deco Green Emerald And Diamond 25 Carat Brooch Art Deco Geometric Emerald And Diamond Double Clip Brooch. We are selling each brooch se...

Art Deco Emerald and Diamond Brooch Clips Circa 1920's in Platinum Two Cushion Cut Emeralds Weighing .70 Carats Approximately Two Old European Cut Diamonds Weighing .65 Carats Appro...

Art Deco Platinum Emerald & Diamond Bar Brooch, c.1920 Overview An elegant Art Deco platinum brooch featuring a vibrant princess-cut emerald as its centerpiece, framed by sparkl...

Art Deco onyx, diamond and emerald cabochon brooch. Set with one hundred and six round old cut diamonds with an approximate total weight of 10....

A stunning, fine and impressive antique Art Deco style 0.48 carat emerald and 1.29 carat diamond, platinum brooch; part of our antique jewelry and estate jewelry collections. This stunning antique diamond and emerald brooch...

Step into the spotlight with this truly spectacular Art Deco platinum and diamond brooch, a highlight from Maxwell Osborn's ensemble at the 2025 Met Gala. This vintage masterpiece is...

An emerald, diamond and onyx Art Deco brooch, ca. 1920, in platinum. The facetted square emerald weighs 2.14 carats and is of Colombian origin. It has an old mine vivid green colour...

Just the right size for day or evening, this unique oval brooch is hand made in platinum, with approximately 4 carats of old European cut diamonds. A lovely marriage of geometric art...

An elegant brooch from the late 1920’s showcasing vibrant green emeralds and dazzling white diamonds. The emeralds are each cut in a classic emerald shape, weighing a total 1. carat,...

An Art Deco diamond, onyx and emerald giardinetto brooch, the pot formed by an onyx embellished with eight old-cut diamonds, the rim flanked with five carre-cut diamonds, the trunk of the tree formed by four trapeze shaped cabochon-cut emeralds and the branches millegrain-set with small diamonds, the diamonds estimated to weigh 2 & ¼ carats in total, all mounted in platinum with platinum brooch fitting, bearing Austrian platinum mark circa 1925, measuring 4 x 1.9cm, gross weight 6.8 grams. This vintage broch is in very good condition for its age. Giardinetto little garden Art Deco flower brooch...

An Old European cut diamond weighing approximately 0.15 carats, G color, VS clarity, centers this stunning two-toned Art Deco brooch with delicate filigree, fashioned in 14kt yellow ...