Vintage 18K Yellow Gold Sapphire and Diamond Art Deco Illusion Ring
Ring (Cocktail/Engagement style) · Two-Tone; features a classic Yellow Gold shank with a White Gold or Platinum-topped illusion setting to enhance the brilliance of the diamonds.
Purity: 18K (750 fineness), approximately 75% pure gold, often alloyed with copper and silver for durability and color.
Type
Ring (Cocktail/Engagement style)
Purity
18K (750 fineness), approximately 75% pure gold, often alloyed with copper and silver for durability and color.
Gold Type
Two-Tone; features a classic Yellow Gold shank with a White Gold or Platinum-topped illusion setting to enhance the brilliance of the diamonds.
Weight
2.5 to 3.5 grams based on the dainty shank and petite basket setting.
Description
A charming example of mid-20th-century jewelry design, this ring features a striking contrast between its warm 18K yellow gold band and its cool, structured gemstone head. The center sapphire is highlighted by a milgrain-textured halo that creates the 'illusion' of larger stones, a technique popular during the Great Depression and WWII to maximize visual impact while conserving materials.
Key Features
Illusion setting, bicolor metal construction, pierced gallery for light entry, and milgrain edge detailing on the setting.
Color & Finish
Rich yellow gold shank with a high-polished finish; the setting face has a metallic white sheen typical of rhodium plating or a platinum veneer with minor age-related patina.
Hallmarks & Stamps
Likely stamped '18CT', '18K', or '750' on the inner circumference of the band. May include 'PLAT' for a platinum top or a maker's mark consisting of initials in a cartouche.
Dimensions Estimate
Estimated ring size US 6-7; central sapphire approximately 4mm x 3mm; halo face approximately 8mm x 7mm.
Gemstones & Inlays
One central rectangular-cut deep blue sapphire (likely natural or high-quality glass doublet) surrounded by a halo of small single-cut or rose-cut diamonds in an illusion bead setting.
Clasp & Closure
Not applicable; solid continuous band.
Chain & Links
Slender D-shape profile band tapering toward the shoulders; features open-work filigree/gallery details beneath the gemstone mounting.
Craftsmanship Details
Hand-trimmed bezel with hand-applied milgrain; the gallery shows evidence of fine sawing or 'piercing' to allow light to traverse the gemstones.
Authentication Indicators
Color uniformity matches 18K alloys; setting style and metal thickness are consistent with vintage hand-finished pieces; lack of casting lines indicates assembly via traditional bench techniques.
Origin & Maker
Likely UK or European origin (possibly Birmingham or London based on commonality of style). Unsigned/unbranded but displays skilled benchwork.
Era & Period
Art Deco to Early Retro (c. 1930s-1940s). The geometric square setting and white-to-yellow metal contrast are hallmark characteristics of this era.
Age Estimate
Approximately 80–90 years old; circa 1935 production.
Cultural Significance
Represents the 'Bold Gold' transition and the persistence of elegance during era-defining economic shifts; common as a period engagement ring.
Condition Notes
Very Good; light surface scratches on the shank. The sapphire shows minor facet wear consistent with age. Settings appear secure.
Value Estimate
Retail Replacement: $850 - $1,200. Melt Value: approx. $150-$180. Primary value lies in the vintage design and aesthetic appeal rather than raw gold weight.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the sapphire is fracture-filled or if pave stones are loose. Store separately from harder gemstones like diamonds.
Similar Items
Early Victorian sapphire clusters (usually deeper yellow/22k) or modern 14K mass-produced commercial halo rings which lack the pierced filigree work.
Interesting Facts
The 'Illusion Setting' was patented by Oscar Massin in the 19th century but reached peak popularity in the 1930s to make small diamonds look like a single large stone.