Sapphire 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 9.5) – sapphires are also used in some non-ornamental applications, such as infrared optical components, high-durability windows, wristwatch crystals and movement bearings, and very thin electronic wafers, which are used as the insulating substrates of very special-purpose solid-state electronics (especially integrated circuits and GaN-based LEDs). Sapphire is the birthstone for September and the gem of the 45th anniversary.
Birthstone as "Navaratna" (nine gems). At birth, an astrological chart is calculated, and certain stones are recommended to be worn on the body to ward off potential problems based on the place of these forces in the sky at the exact place and time of birth. While the term "birthday stone" is sometimes used as a synonym for birthstone, each day of the week is also assigned a unique gemstone and these assignments are distinct from the monthly assignments. Birthstone A birthstone is a gemstone that represents a person's month of birth. Birthstones are often worn as jewelry or as a