"Art Deco 1.60 Carat Diamond Cluster Ring On Gold And Platinum"
18kt white gold and platinum pompadour ring (hallmarked with an owl and a mascaron), set in its center with an old-cut diamond weighing approximately 0.50 ct (estimated color I, estimated clarity VS2) surrounded by old-cut diamonds totaling approximately 1.10 ct. Art Deco work, circa 1930. Gross weight: 2.86g. Ring size: 56 (diameter 17.75 / US 7.75). Motif height: 1.20 cm. Condition: micro-scratches on the gold and platinum parts, wear to the setting, and some minor chips on the diamonds, see photos. 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato