18k Yellow Gold Vintage 1 carat Diamond Blue Guilloché Enamel Geometric Ring

A striking Italian geometric ring from the late 1970s–1980s, crafted in 18k yellow gold with a white‑gold diamond bridge and panels of rich cobalt‑blue guilloché enamel. The interior bears export purity marks “750” and “18K”, consistent with Italian workshop production made for multiple markets. Approximately 1.00 carat of round brilliant diamonds are pavé‑set around the rectangular openwork frame for a bold architectural profile—a look emblematic of high‑style Italian jewelry of the era.

• Material: 18k Yellow Gold (white‑gold diamond setting)
• Stone(s): ~1.00 ct round brilliant Diamonds; cobalt‑blue guilloché enamel
• Period: Late 1970s–1980s (Italian)
• Size: US 5
• Weight: 19.11 grams