Henri Bendel Extremely Rare Gold-Tone Layered Necklace Emerald cut

Three-tier gold-tone necklace with bezel-set emerald cut rectangular stones. Top stone is clear. Middle stone has a smoky gray tint. Bottom stone shows a warm champagne/golden hue. These are 3 separate necklaces that have a special attachment so you can wear 1-3 at time. I cannot find another one of these on the internet. The clasp and mechanism are unusual and a brilliant design. The stones are so shiny and brilliant. A rare unicorn. Serious inquires only. Please treat any offers with an understanding of how rare and collectible and stunning this piece is. Smoke free home.