Art Deco Platinum Sunburst Ring (c. 1935–1941) with 1.55ct Natural Heated Sapphire & Approx. 1.00 ct Antique Single-Cut Diamond Halo

This striking platinum ring dates to the late Art Deco / early Retro period, circa 1935–1941, a time when American jewelry design evolved from geometric restraint toward more sculptural, dimensional forms. The ring is a strong example of the era’s sunburst or starburst motif, one of the most recognizable design languages of the late 1930s.

At the center is a 1.55 carat natural heated oval-cut sapphire, whose rich color provides a vivid focal point against the cool brilliance of the platinum setting. Colored gemstones, particularly sapphires and rubies, were highly prized in fine jewelry of this period and were often incorporated into dramatic geometric and starburst designs. The elongated oval shape of the sapphire complements the radiating architecture of the platinum head, creating a compelling contrast between the organic form of the gemstone and the structured geometry of the setting.

Surrounding the sapphire is a halo of approximately 1.00 carat total weight of antique single-cut diamonds, each set in individual prongs. These diamonds are consistent with the period’s approach to accent stones, where small single cuts were used to provide sparkle while maintaining the crisp architectural character of the design. Their individual settings and period construction contribute to the ring’s authentic late Art Deco appearance.

The defining feature of the ring is its radiating sunburst/starburst platinum head, where elongated platinum “rays” extend outward from the central sapphire. This sculptural composition reflects the transitional aesthetic between late Art Deco and early Retro jewelry, combining geometric symmetry with increased dimensionality and movement.

The shoulders of the ring are equally significant, featuring elongated navette-shaped diamond panels bordered with milgrain detailing and set with pavé single-cut diamonds. This architectural treatment is highly characteristic of American jewelry from approximately 1935–1942 and demonstrates the period’s increasing emphasis on bold, structured forms.

A split shank flows into the shoulder design, further reinforcing the transitional character of the piece. The combination of geometric structure, delicate milgrain, antique single-cut diamonds, and sculptural platinum construction gives the ring considerably more depth and visual complexity than earlier Art Deco designs.

The ring is stamped “10% IRID/PLAT,” indicating a platinum-iridium alloy used in American jewelry during the early-to-mid 20th century. This hallmark is consistent with the ring’s pre-WWII construction and supports its attribution to the late 1930s period.

The combination of a natural heated sapphire, antique single-cut diamonds, milgrain detailing, and radiating platinum architecture makes this an especially compelling example of transitional American jewelry. The sapphire brings a rich burst of color to the otherwise monochromatic platinum and diamond composition, while the sunburst design captures the bold optimism and glamour associated with the period.

This is a distinctive and high-impact piece of late Art Deco / early Retro jewelry, combining the precision and geometry of Art Deco with the sculptural volume and dramatic gemstone presence that would become increasingly characteristic of the Retro era.

Details

• Era: Late Art Deco / Early Retro
• Date: Circa 1935–1941
• Metal: Platinum
• Hallmark: “10% IRID/PLAT”
• Center Stone: Natural sapphire
• Center Stone Weight: 1.55 carats
• Center Stone Shape: Oval
• Center Stone Treatment: Heated
• Accent Stones: Antique natural single-cut diamonds
• Total Accent Diamond Weight: Approx. 1.00 carat
• Setting Style: Radiating sunburst / starburst platinum head
• Halo Design: Prong-set antique single-cut diamond halo
• Shoulders: Navette-shaped diamond panels with milgrain borders and pavé single-cut diamonds
• Shank: Split shank with architectural transitions into the shoulder panels
• Gallery: Open, dimensional platinum construction with sculptural elevation
• Craftsmanship: American pre-WWII platinum fabrication
• Sapphire Note: Natural sapphire with heat treatment
• Condition: Period platinum mounting and antique accent diamonds
• Design Character: Transitional late Art Deco / early Retro
• Overall Style: Geometric, sculptural, architectural, and jewel-toned

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