Zircon is known for its distinctive beauty and occurrence in a broad range of colors. It can be blue, green, colorless, brown, red, orange or yellow. The most popular color is blue and it is considered to be an alternative birthstone for December. Because of its similarity to diamond, colorless zircons have also been popular for years. Zircon sources include Cambodia, Myanmar (Burma), Sri Lanka (Ceylon), Australia, Tanzania, Mozambique, Madagascar, Nigeria, Pakistan, and Afghanistan.