Sapphire stone: Discover everything about sapphire gemstones

Discover everything about sapphire gemstones in this complete guide : types, quality, 4Cs, identification tips, sapphire care & buying advice. Learn about sapphire , a corundum variety that comes in various colors and is the birthstone for September. Find out about sapphire history, lore, treatments, synthetics, and more. Buyer's Guide Sapphire is one of the Big 3 of jewelry gemstones —the other two are ruby and emerald. Sapphire is a durable stone that’s the best known blue gem, as well as being available in most colors. Sapphire is a precious gemstone that is a variety of the mineral corundum, which is composed of aluminum oxide. It is typically blue in color, but can also be found in other hues such as yellow, pink, purple, green, and colorless. The blue color of sapphire is due to the presence of trace amounts of iron and titanium in the crystal structure. Sapphire is one of the hardest naturally occurring substances, with a rating of 9 on the Mohs scale of mineral hardness, and is highly valued for its ...