This Art Deco-Interbellum engagement ring, circa 1930, is a blend of elegance and transitional design, crafted from platinum and set with a stunning, untreated sapphire of approximately 8.59ct, flanked by 18 brilliant-cut diamonds totalling around 1.52ct. The geometric forms and abstract motifs nod to the decorative flamboyance of the era, capturing a moment of stylistic evolution. This piece embodies the spirit of the times - a fusion between the wars where aesthetics led over value, showcasing a history of cultural shifts in its very design.