Dating from circa 1915, this 18K gold and platinum brooch set with a black opal and Montana sapphires by Tiffany & Co. was designed and created under the direction of Louis Tiffany. It is set with an oval black opal cabochon flanked by clusters of Montana sapphires and framed by scrolling platinum wirework accented by gold spherules. With its rich palette of blues and greens, mounted in a graceful, minimalist frame of attenuated wire, this small and precious brooch conveys the aesthetic of Louis Tiffany as well as the sense of the artisan's skilled hand.