This is a beautiful authentic ring is by David Yurman from the Nobelesse collection, it is crafted from sterling silver with 14k yellow gold accent. The cushion shape frame has yellow gold bezel with a large oval amethyst gemstone and sterling silver cable band. It has the designer signature with the metal content.Material: sterling silver and 14k yellow goldHallmark: D.Yurman 925 585Gemstones: Amethyst 9mm long x 7.5mm wideMeasurements: 11.4mm long x 10mm wide x 6.3mm highWeight: 7.3 grams