Composition: Blue sapphires are a variety of the mineral corundum, composed primarily of aluminum oxide. The blue color is due to trace amounts of iron and titanium.
Color: The most desired blue sapphires exhibit a rich, deep blue hue. They can range from pale to very dark blue. The term “cornflower blue” is often used to describe a particularly vivid, medium blue shade.
Clarity: Sapphires can have inclusions, but high-quality stones have minimal visible inclusions. Common inclusions include tiny needle-like rutile crystals, which can create a star effect in some stones.
Cut: Sapphires are typically cut in various shapes, including round, oval, cushion, emerald, and pear. The cut enhances the gemstone's brilliance and showcases its color.
Luster: Blue sapphires have a vitreous (glass-like) luster, which contributes to their sparkle and visual appeal.
