Estate Art Deco Sterling Silver Ruby and Yellow Sapphire Ring. The center ruby gemstone is round cut, prong set, and lined with gorgeous gemstones - yellow sapphire, pink topaz, red sapphire, and blue sapphire. The setting is as stunning as the stones, and each one tests as genuine stones on our Presidium gem tester. Marked Sterling. Measures Approx: just over 3/8" top to bottom of ring x just over 5/8" wide Center stone, 7mm in diameter. Size 8.