Three-Stone Star Sapphire and Diamond Gold Ring

This is a three-stone cocktail or engagement-style ring featuring a center oval cabochon sapphire, likely a star sapphire given its translucency and blue-grey color. The center stone is held by four gold prongs and is flanked by two smaller round brilliant-cut accent stones, which appear to be diamonds or high-quality stimulants, set in gold shoulders. The band is a thin, polished yellow gold, likely 10k or 14k based on typical mid-20th-century construction. The center sapphire exhibits a dense, milky blue saturation characteristic of genuine star sapphires, though the 'star' (asterism) is not clearly visible in this lighting. The setting style suggests a mid-century modern aesthetic, possibly from the 1960s or 1970s. Regarding condition, the metal shows signs of light surface wear and minor scratching consistent with age. There is a slight patina on the underside of the setting. No obvious maker's marks are visible in the image, but such pieces often contain stamps inside the shank. The craftsmanship appears to be standard commercial fine jewelry quality, with symmetrical prong work and a tapered shank design.

Based on my visual examination of this three-stone cocktail ring, I have assessed it as a mid-century piece (circa 1960s-1970s) crafted in yellow gold. The center stone, an oval cabochon star sapphire, displays the characteristic milky blue-grey hue and translucency associated with genuine corundum. It is flanked by two round brilliant-cut diamonds. The overall condition is good, showing minor surface abrasions and patina on the gold, consistent with its age and moderate wear. The market for mid-century 'everyday' fine jewelry remains stable. Similar pieces of commercial grade typically sell within this range as they appeal to vintage collectors rather than gemstone investors. The value is primarily driven by the gold weight and the presence of a natural, albeit likely diffusion-treated or commercially-graded, star sapphire. The lack of a strong, visible asterism in the current lighting slightly limits the top-end value. Limitations & Verification: This appraisal is based solely on digital imagery. Definitive authentication would require a physical inspection to: 1. Confirm the gold purity via acid or XRF testing (likely 10k or 14k); 2. Examine the sapphire under 10x magnification to distinguish between natural and synthetic origin (checking for curved striae vs. hexagonal growth lines); 3. Verify if the diamonds are natural, lab-grown, or stimulants using a thermal conductivity probe; and 4. Inspect the inner shank for hallmarks or maker's marks. A gemological lab report would be required to confirm heat treatments or the presence of 'Lindy' synthetic properties common in this era.