Gemstone Blue Chai Jewelry. Sapphire and blue topaz colored enamel embellish a large open sterling silver Chai. Sold complete with an 18 inch 1.5 mm DC rope sterling silver chain and gift box. From the Sterling Collection. Size: 5 8 inch x 5 8 inch (1.7cm x 1.7cm) Available chain lengths: 16, 20, and 24 inches.