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Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent light. Sapphires can even be gray, black, or brown. Sapphire is the birthstone for September and the gem of the 5th and 45th anniversaries. There are a number of processes used to alter the color, apparent clarity, or improve the durability of gems. Some gemstones have synthetic counterparts that have essentially the same chemical, physical, and optical properties, but are grown by man in a laboratory. Any gem can be imitated—sometimes by manmade materials or by natural materials chosen by man to impersonate a particular gem. Sapphire often contains delicate intersecting needles of rutile that gemologists call silk. Sapphires come in a variety of colors. Preferred sapphires have strong to vivid color saturation, regardless of hue.
It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. Red corundum stones also occur but are called rubies not sapphires. Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry. They also may be created synthetically in laboratories for industrial or decorative purposes in large crystal boules. Because of the remarkable hardness of sapphires — 9 on the Mohs scale the third hardest mineral, after diamond at 10 and moissanite at 9. Sapphire is the birthstone for September and the gem of the 45th anniversary. A sapphire jubilee occurs after 65 years. Sapphire is one of the two gem-varieties of corundum , the other being ruby defined as corundum in a shade of red. Although blue is the best-known sapphire color, they occur in other colors, including gray and black, and they can be colorless. A pinkish orange variety of sapphire is called padparadscha.