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.
Book of the Month Club Book of the Month Club The Book of the Month Club (founded 1926) is a United States subscription-based e-commerce service that offers a selection of five new hardcover books each month to its members. Books are selected and endorsed by a panel of judges, and members choose which book they would like to receive, similar to how the club originally operated when it began in 1926. Members can also discuss the books with fellow members in an online forum. In late 2015, in concert with the club's 90th year, the club announced a relaunch into its current iteration. Within two