Rubies are a vibrant, almost "stoplight" red. Fake diamonds are frequently dull: "light but not dazzling." If the stone is a darker red, it might be garnet rather than ruby. However, if it is a genuine ruby, keep in mind that darker stones are typically more valuable than lighter stones. Also note that rubies can vary dramatically in color and quality. Some are large and bright, others are small and dark. Genuine rubies are found only in three locations on Earth: India, Russia, and America's California. The best gems come from India. Russia's Argyle mine has some of the world's finest rubies. Californian gems include those found in the mountains near Bozeman and Boulder. Ruby is the name given to any one of several transparent or slightly opaque red minerals belonging to the corundum group. The most famous ruby is the Indian gem known as the Crown Prince Rudrappan, which measures 3 cm (1.2 inches) across. Other notable rubies include those owned by Queen Elizabeth II and President Reagan. The word "ruby" comes from the Persian ruj, meaning "red". It was first used to describe an unrefined form of coral used as an ornamentation option for crowns and scepters. Today, it also refers to any red jewel.