The halo style is pretty and bold, both framing and protecting the stone with the protective prong setting surrounding the diamonds and multiple prongs encasing the stone. This is one of our finest amethyst, a natural stone, deep purple, with fine, bright blue highlights. Outstanding in quality and construction, wearable and versatile.Metal: 14K Yellow GoldGem: Amethyst 13.65 CaratsGem Measurements: 17.5 x 14.3 mm,OvalAccents: 22 Diamonds totaling 1.98 Carats, SI1 in Clarity, H in ColorRing Size: 4.50