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.

Based on my visual examination of the provided images, this is a classic halo ring featuring a deep blue oval-cut central gemstone, likely a sapphire, surrounded by a halo of round brilliant diamonds. The setting is crafted in yellow gold, presenting a warm luster indicative of 14k or 18k purity. The ring features a very dark, slightly opaque central stone, approximately 1.5 to 2 carats in size, and is designed with a vintage aesthetic typical of the late 20th century. A notable element is the internal sizing bar, a practical addition for custom fit. The piece appears to be in good overall vintage condition with typical surface wear and minor debris accumulation. In the current secondary market, vintage sapphire and diamond halo rings of this style are moderately demanded, particularly for those seeking alternative engagement rings or classic vintage jewelry. The dark tone of the sapphire limits its premium value compared to highly saturated, vibrant blue stones. Given the materials and style, I estimate the secondary market value to be between $600 and $900. Please note that this appraisal is based strictly on visual inspection of the provided images. Definitively confirming the natural origin, treatment status (e.g., heat treatment), and exact carat weight of the sapphire, as well as the precise grading of the diamonds and the purity of the gold alloy, requires in-person gemological testing using specialized equipment. An independent laboratory report would be necessary to fully establish the central gemstone's characteristics.