This is an old antique Art Deco era rhodium or chrome plate filigree necklace from old estate. Has a makers hallmark of an I between two triangles. Measures 15" clasps and 1 1/8" wide in center. Features open back faceted blue crystal stones clear rhinestones and crystal beads. Under a loupe I see one rhinestone missing. See photo close up. The other clear rhinestones have some cloudiness seen with loupe. See photo close up. Under a loupe I see some very minor green issues you may wish to clean off on front side. See photo close up. On backside of pendant I also see some green issues and discoloration you may wish to clean. See close up. At the necklace back by the clasp one side has a blue bead and other side does not. See photo close up. Fabulous in person. Thanks for looking.