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Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a very small mining area approximately 7 km (4.3 mi) long and 2 km (1.2 mi) wide [4] near the Mererani Hills. [5] Tanzanite is noted for its remarkably strong trichroism, appearing alternately blue, violet and burgundy depending on crystal orientation. [6]
They also replaced December's lapis with zircon and switched the primary/alternative gems for March. The American Gem Trade Association added tanzanite as a December birthstone in 2002. [5] In 2016, the American Gem Trade Association and Jewelers of America added spinel as an additional birthstone for August. [6]
Amazonite, also known as amazonstone, [4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. [4] [5] [6] Its chemical formula is KAlSi 3 O 8, [1] [7] which is polymorphic to orthoclase.
Nearly all tanzanite is heated at low temperatures to remove brown undertones and give a more desirable blue / purple color. [44] A considerable portion of all sapphire and ruby is treated with a variety of heat treatments to improve both color and clarity.
Ruby ring. A ring is a round band, usually made of metal, worn as ornamental jewelry.The term "ring" by itself denotes jewellery worn on the finger; when worn as an ornament elsewhere, the body part is specified within the term, e.g., earrings, neck rings, arm rings, and toe rings.
A dearest ring in which the T is represented by tourmaline instead of topaz. An acrostic ring is a ring on which the initials of the precious stones on the band spell out a word in an acrostic style. In some cases, paste gems were used instead of precious stones. [1] [2]
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