Wonderful Miami Studio Ring dating to the 1970s. It was created by melting down 4 family rings of 14k and 18k Gold and reseting the diamonds. They are set in White Gold or Platinum. Measures 7/16 inch at center and is size 5 1/4. High quality and great design. It is not hallmarked but Jeweler tested as solid gold. At least 14k and more likely close to 18k. I love it. Great price for materials and quality.