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.
Sapphire Princess being constructed at the same time, so the original "Sapphire" assumed the role of "Diamond". This name swap assisted in keeping the delivery date of "Diamond Princess" on time, and kept "Sapphire Princess" on schedule as it was nearing completion early. "Sapphire Princess" was the second Princess Cruises ship to be built in a Japanese shipyard, and lacks the "wing" or spoiler across the rear which can be seen on "Golden Princess". At the beginning of 2012 "Sapphire Princess" was refitted with Princess' signature "Piazza" in place of the center atrium, including the International Café and a pizzeria. Princess also