Sts Gems Thai Ltd
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描述
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描述
- Tanzanite stone in oval shape.
- Captivating gemstone in violetish blue.
- Multifaceted tanzanite that exhibits irresistible shine and brilliance.
- Dramatic yet delicate precious gemstone in an appealing hue.
- Breathtaking and sumptuous gemstone.
- Add subtle elegance to your jewelry pieces.
- Tanzanite is the blue/violet variety of the mineral zoisite group. It was discovered in the Mererani Hills of Manyara Region in Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. Tanzanite is used as a gemstone, and naturally-formed tanzanite is extremely rare gems stone.
- There is no universally accepted method of grading colored gemstones. TanzaniteOne is a major commercial player in the tanzanite market through its non-profit subsidiary. The Tanzanite Foundation has introduced its own color-grading system. The new system's color-grading scales divide tanzanite colors into a range of hues, between bluish-violet and violetish-blue.
- Tanzanite forms as a brownish crystal and is trichroic - which means it shows three colors - brown, blue and violet concurrently. Heating - either occurring underground naturally by metamorphic occurrences or above ground by man in a furnace removes the brown or burgundy color component to produce a stronger purplish-blue color and makes the stone "dichroic" which means it only reflects blue and violet. Rarely, gem-quality tanzanite will heat to a green primary hue, most always accompanied by a blue or violet secondary hue. These green tanzanite have some meaningful value in the collector market, but are seldom of interest to commercial buyers.
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