Vintage Stainless Steel Pendant featuring a cabochon Jade stone

This is a vintage stainless steel? pendant featuring a cabochon jade stone in what appears to be a modernist or Art Deco-inspired design. The pendant has an openwork diamond/rhombus-shaped frame with decorative cutouts and scrollwork details that create visual interest around the smooth, polished green jade centrepiece.
• Natural jade cabochon (appears to be nephrite jade based on the deep green color)
• Modernist/Art Deco style openwork design
• Diamond-shaped frame with decorative pierced metalwork
• Bail for chain attachment
• Appears to be vintage, likely mid-20th century

It is well worn, as you will see in the photos, like it was someone’s favourite piece of jewellery.