Coster Diamonds, founded in 1840 by Moses Elias Coster, concentrates on the craft of diamond cutting and polishing. Get a more detailed look at this delicate process by joining one of the free guided tours, where you'll learn about the stages from beginning to end and watch people at work. Plus, you have the opportunity to browse the extensive collection at the end of the tour. With all the rings, earrings, necklaces, bracelets and lose stones on display, who knows; you may fall in love with a new piece of jewelry. If you want to learn even more about diamonds, visit the Diamant Museum next door. You'll explore the history and science of this sparkling gem.