Art Deco o18ct white gold necklace with a centrally oval solid white opal cut en cabochon, a geometric frame, a row of round brilliant cut diamonds, calibre cut sapphires, a trefoil of baguette and round brilliant cut diamonds, a crescent section and a row of three graduated diamonds, an 18ct white gold necklace of baton links interspaced with thirty round brilliant cut diamonds and mounted in illusion settings to a diamond set clasp