Zircon - Zircon comes in a wide variety of colors such as blue, green, yellow and red. This gem is found in Sri Lanka, Thailand and Cambodia. Zircon should be immersed in warm soapy water or a jewelry solution to clean. Avoid using an ultrasonic cleaner as it will be damaging to the gem. A Zircon is believed to bring peaceful sleep, wealth and protection against wounds to its wearer. December birthstone.