Chaumet Rings. Josephine Aigrette series. SKU: 085041. Metal Type: White Gold. Metal Stamp: 18k. Gem stone type: Diamond. Chaumet 18k White Gold Josephine Aigrette Diamond Ring. The Josephine Aigrette ring in 18-carat white gold features a 0.18-carat Akoya cultured pearl and 23 brilliant-cut G VS+ diamonds totaling 0.40 carats, with a width of 2.5mm.