Like rubies, sapphires can come with a natural six rayed star inside, which is called the ""star sapphire"" and is extremely rare. The most desirable color sapphire is blue, and the most desirable shade of blue is referred to as "cornflower blue."" It is neither light nor dark blue. Heat treatments have become common in recent years, as a way of improving color as the beauty of a sapphire is judged by the richness and intensity of its color. The color of a sapphire is created by various amounts of iron and titanium in the stone, the combination of which produce varying colors. ![]() Fine sapphires are most available under two carats, but they can also be found in sizes from five to ten carats.
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