Art Deco Platinum Toi et Moi Ring – Marquise Fancy Yellow Diamond & Blue Sapphire | Petra Star

This sensational 1930s Art Deco Toi et Moi ring takes the classic bypass design to new heights, pairing a striking GIA-certified 0.94 ct fancy brownish yellow marquise diamond with a vivid 1.21 ct natural blue sapphire. Securely set in a beautifully handmade platinum mounting, the centerpiece stones are accented by a halo of baguette, round brilliant, and single cut diamonds (totaling 0.14 cts, G/H VS1-2), all meticulously pavé and prong set for maximum brilliance and refinement.

Unlike bulkier designs, this vintage masterpiece boasts a perfectly graduated shank, low finger profile, and delicate but secure prongs—making it both visually refined and supremely comfortable. The color contrast between the sunny marquise diamond and deep blue sapphire is the hallmark of rare Art Deco style, and bespoke hallmarks (serial 59977 PT 950 SC 10% IRID.PLAT) attest to its period authenticity and superb craftsmanship. With elegant geometry, original platinum, and remarkable stones, this bypass ring stands apart as a true connoisseur’s jewel.

• Era: Art Deco, circa 1930s
• Metal: Handmade platinum, 10% iridium, hand-inscribed serial + 18k yellow gold
• Diamond: 0.94 ct GIA fancy brownish yellow, marquise cut, SI1 (10.81 x 7.22 x 4.44 mm), GIA #6157001787
• Sapphire: 1.21 ct natural oval, strong blue (5PB 4/10 GemGuide), VS clarity (7.28 x 4.85 x 3.82 mm)
• Accent Diamonds: 6 = 0.14 cts, straight baguettes, single & round cut, G/H VS1-2
• Design: Low profile, bypass, graduated shank, delicate prongs
• Measurements: 14.3 mm, 2.7–1.7 mm wide
• Size: 6.5 (inquire for sizing options)
• Condition: Exceptional Art Deco condition

What Makes This Ring Exceptional:

• Rare contrast: Fancy yellow marquise diamond & saturated blue sapphire
• Authentic Art Deco geometry, hand-set in richly detailed platinum
• Graduated, non-bulky shank and delicate settings for true vintage elegance
• GIA lab report and full hand-inscribed markings for authenticity
• An heirloom-quality, showstopping “you and me” ring perfect for connoisseurs, collectors, vintage engagement seekers, and admirers of rare colored gemstones