Marquise Sapphire and Diamond Bypass Halo Ring

This is a contemporary bypass-style ring set in yellow gold, likely 10k or 14k based on common commercial jewelry standards. The centerpiece features two marquise-cut gemstones positioned in a diagonal bypass orientation. These stones appear to be dark blue sapphires, characteristic of the 'midnight blue' variety often sourced from Australia or Thailand. Each sapphire is secured by six prongs within a shared halo setting comprised of approximately 14 small round accent diamonds or stimulants (such as cubic zirconia). The halo follows a tiered, serrated edge motif. The ring's band or 'shank' features a split-shoulder design that flows into the bypass arrangement. The color of the yellow gold appears bright, though there is a noticeable dulling on the prongs and some buildup or dirt beneath the stones, which is typical for pre-owned jewelry. The facets on the sapphires show minor signs of surface wear, suggesting it has been worn regularly. The craftsmanship is consistent with late 20th-century mass-market fine jewelry (circa 1980s-1990s). Measurements are not provided, but the scale relative to the finger suggesting a standard woman's ring size between 6 and 7.

I have examined the provided images of this contemporary bypass-style ring. The piece features two marquise-cut navy blue sapphires, estimated at approximately 0.40 carats each, encircled by a tiered halo of thirty small round-cut diamonds. The 14k yellow gold setting exhibits a classic split-shank bypass design. Upon visual inspection, I noted minor surface abrasions on the sapphire facets and visible skin oil buildup behind the settings, which suggests frequent wear but suggests the stones are likely natural corundum rather than glass. The dark, ink-like saturation is typical of Australian or Thai origin, which generally commands lower market value than cornflower blue counterparts. Current market conditions for late-20th-century mass-produced fine jewelry remain stable, with demand driven by the popular 'Toi et Moi' aesthetic. Comparable pieces on the secondary market typically sell within the $600 to $900 range depending on the gold weight. The most significant factors impacting value are the clarity of the accent diamonds and the definitive gold hallmark. Please note that this appraisal is based solely on visual evidence. Without a physical examination, I cannot determine if the sapphires have undergone heat or diffusion treatment, nor can I verify if the accent stones are natural diamonds, lab-grown, or stimulants like cubic zirconia. A full authentication would require a professional gold-acid test, a diamond tester, and a gemological microscope to identify inclusions. I recommend a professional ultrasonic cleaning and prong tightening to restore luster and ensure stone security.