The ring in the image is a vintage Lindenwold ring with a large green central stone, likely cubic zirconia, set in a gold-plated or gold electroplated metal, not 18k solid gold. Lindenwold Fine Jewelers is known for selling both genuine and simulated gemstones, particularly high-quality cubic zirconia (CZ) and their own “DiamondExcel” brand. This piece from the vintage era is marked “18K HGE” (Heavy Gold Electroplate) over a base metal like sterling silver, rather than being solid gold. This vintage Lindenwold jewelry features a simulated emerald-colored cubic zirconia along with 4 small clear Cubic zirconia stones.