Oval Sapphire and Diamond Halo Ring in Yellow Gold

This piece is a classic 'Princess' style halo ring featuring a large, oval-cut central gemstone, likely a dark blue sapphire based on its deep navy saturation. The central stone is approximately 1.5 to 2 carats, secured by multiple yellow gold prongs within a floral-inspired halo of approximately 14 round brilliant diamonds. The setting is constructed from yellow gold, which displays a warm luster characteristic of 14k or 18k purity. A highly notable feature of this specific item is the sizing adjustment mechanism—a metal sizing bar or 'spring-insert' inside the bottom of the shank, typically used to provide a secure fit for larger knuckles or to slightly decrease the ring size without permanent modification. The overall construction suggests a late 20th-century aesthetic (circa 1970s-1990s). The piece appears to be in good vintage condition with minor surface scratches on the gold shank and some accumulation of debris beneath the stones, which is common with wear. The crown is high-set, allowing for light to enter the stones from below, though the central sapphire shows a very dark, almost opaque color profile from this angle. The craftsmanship shows quality prong work and a sturdy bifurcated shoulder design leading into the central gallery.