Bidspirit auction | Retro tank ring adorned with

Retro tank ring adorned with engravings and laboratory-grown blue spinels - Material: Pink gold (18k); silver for certain adornments Weight: 8.99 grams Laboratory-grown blue spinels Additional Information Official Porto, Portugal hallmark for 19.2k gold (800/1000) and mixed gold and silver jewellery, used between 1938-1985; subsequently Dutch import hallmark, standardized at 750 with Dutch hallmark for old jewellery Portuguese workshop approx. mid-20th century Professionally cleaned in 2023 Size: 59 / 18.8