"Would you know the difference between prehnite, variscite, and jade? Or a diamond and a cubic zirconia? Could you identify the different diamond cuts, and would you choose a diamond by its cut alone? Gemstones have fascinated people for thousands of years. In ancient times they were worn as amulets and talismans, offering protection against ghosts, repulsing evil, preserving health, and warding off the plague. A link with astrology was formed, and gemstones were allocated to the signs of the zodiac. At one time, precious jewelry was a way to recognize the truly rich as opposed to mere pretenders to power and wealth. From the historical to the scientific, this extraordinary reference is filled with fascinating facts about gemstones, both precious and semiprecious. It's also a worldwide scientific survey, with stunning color photographs of each gem and its varieties. This fifth edition includes information on a total of 1,800 gemstones in all"--Dust jacket cover.