Antique Art Deco Platinum Diamond Engagement Ring

Authentic Art Deco Platinum Diamond Engagement Ring · 1.50 ctw · 1.20 ct Center · Circa 1930s

A genuine Art Deco engagement ring dating to the 1930s, masterfully crafted in platinum with a 10% iridium alloy-an important hallmark of true period construction and durability. This is not a reproduction, but an authentic example of early 20th-century design, defined by its architectural precision, refined symmetry, and distinctive hand-finished details.

At the center sits a 1.20 carat natural round diamond, measuring approximately 6.4 mm, graded J color and SI1 clarity. The stone is secured in classic fishtail prongs, a defining feature of the era, designed to elevate the diamond while maximizing light return. The diamond presents with strong brilliance and a soft, slightly warm tone that pairs beautifully with the platinum mounting.

The shoulders are accented with six additional round diamonds, totaling approximately 0.30 carats, arranged in a linear formation that enhances balance and proportion while maintaining the elegance of the center stone.

The mounting itself reflects true Art Deco craftsmanship-clean geometry, elevated structure, and refined detailing that distinguish authentic period pieces from later reproductions.

Specifications

Metal: Platinum (10% Iridium Alloy)
Hallmark: 10% Irid Plat
Weight: 4.81 grams

Ring Size: 6.5 (resizable by any qualified jeweler)

Shank Width: 1.1 mm
Head Height: 7.8 mm

Diamond Details

Center Diamond:
Weight: 1.20 carats
Measurements: Approx. 6.4 mm
Color: J
Clarity: SI1
Setting: Fishtail prong

Accent Diamonds:
6 round-cut diamonds
Approx. 0.30 carats total weight

Condition

Pre-owned example, professionally cleaned and polished.

The mounting remains crisp, with well-preserved prong work and strong structural integrity. All stones are secure, and the ring presents beautifully with light wear consistent with age.

Collector's Perspective

Authentic Art Deco rings continue to command attention as collectors move toward originality and true period craftsmanship.

The presence of 10% iridium platinum, combined with hand-finished fishtail prongs and balanced geometric design, places this ring firmly within the era. The center stone's proportions and clean side accents reflect the restrained sophistication that defines Art Deco jewelry.

Pieces like this offer what modern rings cannot replicate-authentic history, craftsmanship, and enduring design integrity.

Equally suited as a one-of-a-kind engagement ring or a collectible example of early platinum work.

Authenticity Guarantee

All items offered by Hannosh's are thoroughly tested, authenticated, and exactly as described. Every piece is reviewed by our in-house jewelers and gemologists prior to listing.

Additional Viewing

For additional photos or video, please text 586-482-4022 during the pre-bidding period. Requests are not available during the live auction.