Vintage Oval Jadeite and Diamond Cocktail Ring

This is a vintage mid-century style cocktail ring featuring a large, oval cabochon-cut jadeite jade central stone. The jade exhibits a vibrant, translucent 'imperial' green hue with a smooth, high-polish finish, measuring approximately 15mm in length. The center stone is secured by four substantial gold prongs. Flanking the central jade on the shoulders are eight round brilliant-cut diamonds (four on each side), set in silver-toned or platinum-colored baskets to enhance their brilliance. The mounting is constructed from yellow gold, likely 14k or 18k, showcasing an ornate 'birch bark' or textured finish on the substantial shank. A notable feature is the hinged 'Finger Fit' or expandable mounting design, which allows the ring to open and close over a large knuckle for a secure fit. The condition shows moderate vintage wear, including surface scratches on the metal and some darkening or tarnish (patina) around the stone settings. There is a visible hallmark or maker's stamp on the interior shank, though it is not fully legible from the image. The craftsmanship suggests a bespoke or high-end commercial piece from the 1960s-1970s, characterized by the heavy gold construction and the specific technical hardware of the adjustable shank.

I have virtually examined this vintage mid-century jadeite and diamond cocktail ring. The centerpiece is a notable 15mm oval translucent jadeite cabochon. If the color is naturally occurring 'Imperial' green, this significantly elevates the value. The mounting features approximately 0.40 total carat weight in round brilliant diamonds set in a high-quality 14k or 18k yellow gold textured shank. The inclusion of a branded 'Finger Fit' adjustable hinge suggests a high-end bespoke manufacture from the 1960s-1970s. The condition is consistent with age, showing a desirable patina and minor surface wear. The market for mid-century 'statement' jewelry remains strong, particularly for pieces with technical flourishes like the expansion shank. However, the primary value driver is the jadeite. Critical limitations exist: I cannot definitively confirm if the jade is Type A (natural, untreated), Type B (bleached/polymer impregnated), or Type C (dyed) from images alone. A laboratory report from a recognized body (such as GIA) is essential to confirm the absence of treatment; Type B or C jade would reduce this valuation by 70-80%. Furthermore, the metal purity and specific diamond grades must be verified in person via acid testing or XRF analysis. The valuation provided assumes Type A jadeite and 14k-18k gold purity based on the visual indicators of craftsmanship and wear patterns observed.