Oval Black Star Sapphire and Diamond Accent Ring

This is a fine jewelry ring featuring a central oval cabochon-cut black star sapphire estimated to be approximately 1.0 to 1.5 carats. The sapphire displays a distinct asterism, showing a six-rayed star under direct lighting, characteristic of high-quality corundum with needle-like rutile inclusions. The gemstone is held in a four-prong setting within a yellow gold mounting, likely 10k or 14k gold. Flanking the central stone on each side of the shank are small, round-brilliant accent diamonds set into a split-shoulder or bypass-style architecture. The band is slim and polished, tapering towards the base. The construction appears to be machine-cast with hand-finishing, typical of mid-to-late 20th-century jewelry design (circa 1970s-1990s). The piece shows signs of light wear, including minor surface scratches on the gold band and a slight patina consistent with age. There are no visible cracks or heavy abrasions to the central sapphire's surface in the current view. While maker's marks are not visible from this angle, they would likely be found on the interior of the shank. The overall craftsmanship is consistent with commercial-grade fine jewelry produced by reputable retailers of the era.

I have completed a visual examination of the Oval Black Star Sapphire and Diamond Accent Ring. The central 1.0–1.5 ct black star sapphire exhibits a clear, well-centered six-rayed asterism, indicating quality rutile inclusion density. The 10k/14k yellow gold mounting shows a bypass architecture popular in the late 20th century. The condition is 'Good,' with minor surface abrasions on the shank consistent with elective wear, but no structural damage or chips to the gemstone. The market for mid-century commercial-grade gemstone rings is currently stable, though not high-growth. Similar comparables in the secondary market (estate auctions and specialized vintage retailers) typically fetch between $400 and $700 depending on actual gold weight and diamond clarity. Black star sapphires are relatively common compared to blue or star rubies, which limits the rarity premium. Several factors necessitate a physical inspection for a definitive valuation. First, without a loupe, I cannot confirm if the star is natural or diffused/synthetic, though the surface luster suggests natural origin. Second, the absence of a hallmark makes the exact gold purity (10k vs 14k) an estimate, which significantly affects the scrap melt value and overall appraisal. Finally, the accent diamonds require 10x magnification to determine color/clarity and to ensure they are not lab-grown or CZ substitutes. A full authentication would require an electronic gold tester, a refractometer, and a review of any original purchase provenance.