Platinum, gold and diamond Art Nouveau ring

Authentic platinum and 18K gold Art Deco period engagement ring set with a 0.17 ct Old European cut natural diamond, two smaller diamonds of 0.07 ct each and 10 small rose cut diamonds. Estimated total diamond weight 0.40 ct, Diamond clarity VS-Si G-H colour, two 0.07 ct. Current ring size 17 (cross-section), 54 (ircumference), US size 6½, UK size N, Resizing included.