TURQUOISE, ZIRCON, TANZANITE From Egypt and Persia (Iran) to Tibet and the Americas, turquoise has been treasured for its beauty since prehistoric times. 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. Turquoise can be green, yellow-green, blue-green, pale blue or dark blue. It may or may not include a "matrix" of roc