Dec 27 Dec 27 Montblanc 4810 Eternity Ring in 18k White Gold with Diamonds Polka Popp Charlotte Casiraghi, Accessories, Rings Montblanc 4810 Eternity Ring in 18k White Gold with Diamonds From the 4180 collection. Purchase Worn by Charlotte Casiraghi on:19 January 2015 - Montblanc photocall2 May 2016 - MET Gala Leave a comment