Louis Comfort Tiffany was fascinated by unusual and unconventional stones. Sapphires from the Yogo Gulch Mine in Montana captured the color and brilliance that he was looking for in his materials. Similarly, the dynamic play-of-color in black opals, coupled with multi-colored enameling, is reminiscent of his earlier pioneering work in glass and windows. He was a master of combining vibrant colors to emulate the natural world. He was especially fond of combining blue and green and how the combination was evocative of peacocks, a recurring motif in his work.