New vintage jade pendant necklace

New vintage jade pendant necklace Unusual curvy setting. Like Art Nouveau or Downton Abbey. 4 oval jade cabochons. 2 faux diamonds. Swirly, curvy shape. Looks like rose gold or copper. Pendant: 13x30 mm not including bail Bail: 2x4 mm Flat Cable Chain: 18”, 1 mm New vintage c. 1970s. Genuine B.C. Jade / Nephrite. Probably gold plate. Hallmark on chain: stylized diamond with “SN” or “NS”. No visible hallmarks on pendant. Note: the gold plate has darkened to look like rose gold or copper. No black marks. But price is reduced. Note: see identical necklace in shiny gold plate.