Found primarily in Australia as well as Mexico, opals are delicate by nature. During the Middle Ages topaz was thought drive away sadness, bring wisdom, bestow courage, and even cure insomnia. A common misconception is that all topaz is yellow. Brazil is the most important source of this stone. Hindus and Persians believed that one who observed the reflection of the moon on a turquoise was assured good luck, protection from evil and great wealth.
Color is the superlative gem property of turquoise.
Found in the southwestern United States and Mexico, the richest blue specimens are from Iran.