Tank ring in gold, platinum and old cut diamond 0.25ct

Tank signet ring in 18k (750°/°°) gold and platinum composed of two bodies forming a swirl and set in its center with an "old European cut" diamond weighing approximately 0.25ct (G SI1, no inclusion visible at the naked eye). French work from the 1940s.

Finger size: 49, sizing possible
Gross weight: 9.76 grams