The product is an authentic 14k white gold Art Deco onyx and diamond ring stamped "A&S." This antique ring features a natural black onyx as the main stone and a diamond secondary stone, set in a cocktail style design typical of the Art Deco era (1915-1935). With a vintage appeal and a hint of Art, this ring is a perfect choice for an anniversary occasion, making it a timeless piece for women who appreciate fine jewelry craftsmanship.I couldn’t get a picture of stamp but it is stamp S&A 14 k