Circa 1930 Art Deco Platinum Engagement Ring

Dating to circa 1930, this Art Deco platinum engagement ring features a 0.70-carat round transitional brilliant-cut diamond with SI1 clarity and I color, secured in a four-split-prong setting. Six bead-set round single and brilliant-cut diamonds, totaling 0.10 carats, with SI2–I1 clarity and E–F color, accent the gallery. Two bezel-set triangular French-cut lab-grown blue sapphires, totaling 0.08 carats, flank the center diamond.

Engraved wheat motifs and delicate milgrain borders decorate the platinum shoulders, which sweep toward the center setting before tapering into a slender shank. The triangular blue stones introduce a geometric contrast to the round diamond, while the finely engraved metalwork adds texture and definition.

Transitional brilliant-cut diamonds reflect the evolution of diamond cutting during the early 20th century, bridging the old European cut and the modern round brilliant. Their appearance in Art Deco jewelry illustrates how changing diamond-cutting techniques and contemporary design developed alongside one another.