1920s 18ct White Gold Blue Spinel and Onyx Art Deco Ring

A beautifully composed Art Deco blue spinel and onyx ring, dating to the 1920s and crafted in 18ct white gold.

At its centre sits a vivid aqua-blue synthetic spinel, cut in a bold rectangular form with crisp facets that catch the light beautifully. To either side, sleek black onyx panels provide a striking contrast, enhancing the clean, architectural lines that define the Art Deco aesthetic.

The design is quintessentially of the period—balanced, geometric and confident—offering a wonderful sense of presence on the finger without being heavy. Elegant yet distinctive, this is a piece that speaks effortlessly of 1920s style.

Synthetic spinel and black onyx were widely used during the Art Deco period. Advances in gemstone synthesis allowed jewellers to achieve vibrant, consistent colour, while onyx provided dramatic contrast. Together, they became a hallmark of the era’s bold, modern designs—valued not for rarity, but for their striking visual effect and harmony of form.

Art Deco period, circa 1920s

18ct white gold (marked 18ct and later mark 750)

Synthetic blue spinel centre stone

Black quartz (onyx) shoulders

Rectangular / modified emerald-style cut

Centre stone: approx. 9.0 x 7.2mm

Onyx: approx. 5.5 x 1.5mm each

Head size: approx. 12mm x 9.7mm

Height from finger: approx. 4.4mm

Weight: 3.3 grams

UK ring size: P

Maker’s initials LS

Personal inscription “ELSIE” to inner band

Accompanied by Birmingham Assay Office gemmology report

Excellent condition

Presented in the box illustrated

Our ref: 2622

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We have years of knowledge and experience in dealing in antiques and antique & designer jewellery. We are committed to giving exceptional customer service. The Chelsea Bijouterie aims to offer beautiful and interesting items at affordable prices.