Sapphire and Diamond Cluster Ring. Sri Lanka is known as ‘the isle of gems’ for its huge variety of mineral deposits, but there’s no stone it’s more famous for than blue sapphires. With their soft, slightly violet ‘cornflower’ blues, Sri Lankan sapphires (often still referred to as ‘Ceylon’ stones) have been traded and prized around the world for thousands of years, finding their way into everything from Roman cameos to medieval reliquaries. In the middle ages, the blue of sapphires gave them a strong association with heaven and the Virgin Mary, and so were a popular choice for ecclesiastical jewels. This heavenly blue unheated Sri Lankan sapphire weighs just short of five carats, and is encircled by a border of early 20th century single-cut diamonds in a millegrain border. A truly classic cluster ring - Princess Diana would approve.