Ultra Rare Soviet 583 Rose Gold Men's Ring 0.73 ct Diamonds – Flawless New Old Stock (NOS) condition with original factory tag and intact lead seal from the Yerevan Jewelry Factory (ЕЮЗ). * Manufacturer: Yerevan Jewelry Factory (Soviet Union / Armenia), marked "ЕЮ" on the tag and lead seal. * Material: Soviet 583 Rose Gold (the iconic hammer and sickle star hallmark is perfectly crisp and clearly visible). The diamond setting is finished in white metal to maximize brilliance. * Total Weight: 6.45 g. * Ring Size: 17 (EU 53 / US ~6.5 - 7). * Model/Item No.: 11407. * Standards: TU 25-07-1319-77 / OST 25-565-75. UNIQUE COLLECTOR'S FEATURE (Rarity): The original handwritten factory tag reads "7 Бр" (7 diamonds). However, the master jewelers at Yerevan actually created a magnificent composition of 9 natural round-cut diamonds (Kr-17) on the ring itself (1 larger central diamond surrounded by 8 diamonds). This rare factory anomaly (an error by the quality control inspectors of that era while maintaining the exact total carat weight) makes this untouched piece an incredibly valuable artifact for serious collectors of USSR jewelry! The stones have incredible clarity, fire, and exceptional brilliance.