An Important Art Nouveau Opal and Diamon

An Important Art Nouveau Opal and Diamond Pendant,
containing one fine oval semi-crystal opal weighing approximately 17 carats, two round fine opals weighing approximately 2 carats each, two smallerr round opals each set in 18 karat yellow gold bezels, framed by numerous single-cut, rose-cut, and old European-cut diamonds weighing approximately 1.70 carats total, set in the finely hand-crafted platinum setting; the center section is detachable from the top and bottom and may be worn as a brooch.