J. Crew Necklace Navy Blue ClearRhinestone Gold Toned Collar Baquette Cabochon Excellent pre-owned condition, light signs of age/wear. See photos. The cabochon oval stones photographed darker than they are in person, they are more of a navy blue in real life. It measures about 18" long with a 3" extender and is 1" at it's widest point and about 0.5" deep.