Free Worldwide Shipping     -     Free Ring Re-Sizing     -     Free Luxury Ring Box    

Antique Art Deco, French, 18ct White Gold, Cobalt Spinel and Diamond Ring


This product is no longer available to purchase.

Product SKU: ARB-270
Spinel and diamond ring, circa 1925. Spinel is a superb and historically important gemstone, often found alongside its more famous rivals ruby and sapphire, and as a consequence, were often mistaken for them until the 18th century, when advances in mineralogy led to their recognition as distinct stones. This spinel owes its striking teal colour to traces of cobalt. While cobalt was commonly added to synthetic spinels in the early 20th century, natural cobalt spinels such as this are extremely rare, with more complex shades of blue, making them highly sought-after as a result. Set within a border of brilliant-cut diamonds, this mysterious blue stone makes an intriguing and interesting alternative to the classic sapphire and diamond cluster ring.


Place Of Origin


Stone Type

Spinel: Approx. 1 carat total
The spinel is natural, with no indications of heat treatment

Diamonds: Approx. 0.45 carats total

Stone Dimensions

Central spinel: 6.8mm x 6.2mm x 4mm

Height of setting: 8mm
Width of setting at front: 13.3mm x 14.5mm

Metal Type

18ct white gold


French mark of an eagle

Date Of Manufacture

1920 - 1930

Period Of Manufacture

Art Deco



Signs Of Wear

Minor wear commensurate with age

Band Size

UK M / US 6.5 (complimentary re-size available)


4.70 grams (gross)