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Zircons were called "jacinth" or "hyacinth" in older writings. Zircons are exceptionally brilliant gemstones; the high zircon has the highest refractive index of any natural transparent gemstone. High zircons are usually blue or colorless. Fine blue zircons are rare, but they are exceptionally beautiful stones.... (1999) Complete Story
If you are looking at a tanzanite it is critical to view it under different lighting conditions. In daylight tanzanite will display the most blue, incandescent light will bring out the violet color. Generally those stones that are brilliant blue with minimal violet, even in incandescent light, will command the highest price. If you prefer the violetish shades you will pay less.... (1999) Complete Story
