An Art Nouveau opal and diamond pendant

An Art Nouveau opal and diamond pendant, the central oval-shaped cabochon-cut opal weighing approximately 5.00 carats, set within a cluster of old-cut diamonds in an openwork scrolling diamond-set foliate surround, suspending a smaller opal drop, all suspended by a diamond-set loop, approximate total diamond weight 3.75 carats, all set in silver to yellow gold, gross weight 14.10 grams, circa 1900s

No. 30560M