Sapphire, Ruby’s blue sister, is the blue variety of the mineral corundum—the second hardest mineral in the world (after Diamond). Sapphire is mined in many colors, but blue has long been the most prized and popular. The velvety deep blue Sapphires from Kashmir and Burma are becoming more and more rare, while Sapphires from Sri Lanka and Madagascar are taking over the market in a range of blues from light sky to deep midnight. The quality and worth of a Sapphire is due more to its color than its carat. An “eye clean” Sapphire means that no inclusions are visible to the naked eye, although fine, silk-like strands through the stone can actually enhance the look of a sapphire. In fact, this “silk” is what gives the Star Sapphire its distinctive appearance. Sapphires have a habit of becoming famous—like the Star of India, a 536-carat stone currently possessed by the US Museum of Natural History. Sapphire is the elegant birthstone for those born in September.