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1.84ct PEAR NATURAL MINED GOLDEN YELLOW IMPERIAL TOPAZ
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1.84ct PEAR NATURAL MINED GOLDEN YELLOW IMPERIAL TOPAZ
1.84ct PEAR NATURAL MINED GOLDEN YELLOW IMPERIAL TOPAZ
1.84ct PEAR NATURAL MINED GOLDEN YELLOW IMPERIAL TOPAZ
1.84ct PEAR NATURAL MINED GOLDEN YELLOW IMPERIAL TOPAZ

1.84ct PEAR NATURAL MINED GOLDEN YELLOW IMPERIAL TOPAZ

Price: $218.00 add to cart     
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Shipping& PAYMENTInternational Shipping Return Policy• Any item may be returned for refund within 7 days of receipt. Item(s) must be returned in original condition.• Return is subject to a 10% withdrawal of value of order as a restock fee. Shipping costs are non-refundable. Video Clip of Actual itemPlease wait while loading ............Flash Player, Click Here! Add to Favorite Stores | Sign up for Store newsletterItem Number:WTP003-038-007.Quantity:1piece.Weight:1.84 Carat.Gem Type:100%Natural Imperial Topaz.Shape:Pear, Portuguese Cut.Size in millimeter:11.5 Length. 5.4 Width. 3.7 Deep.Color:Golden Yellow.Clarity:SI1.Luster:Very Good.Origin:Ouro Preto, Brazil (Black-Gold Mine).Treatment:Unheated, Untreated.Hardness:8.0.Refractive Index:Colorless, Blue and Green 1.609 to1.617, Yellow, Brown and Orange Red 1.629 to 1.637.Specific Gravity:3.49 to 3.57.100% Ouro Pr๊to Black-Gold Mine, Money Back GuaranteeOuro Pr๊to Mines History Ouro Pr๊to mines produce orange to pinkish-purple topaz. Often the stone has been confused with the more common citrine (which is made by heating amethyst) found profusely in other Brazilian localities. However, topaz is readily identified by its superior hardness, density, and brilliance, as well as by a pronounced basal cleavage. In the early days topaz was the only gem of importance found near Ouro Pr๊to. Honoring Brazilian royalty, the gemstone was frequently referred to as “imperial” topaz. Later some sources called it “precious” topaz. Both terms have endured, partly because gem merchants wish to impart to customers the difference between gem topaz and citrine quartz. Topaz mine at Dom Bosco, 1938. Photo: Edward SwobodaCommon topaz crystals are prisms which generally measure from 5 to 3 centimeters. The largest reportedly measures 50 by 8 centimeters and probably a score of crystals have been found in lengths over 15 centimeters. The larger specimens often were broken along cleavages, however, and little care was taken to keep the pieces of each crystal together for repair; thus few such giants exist intact today. Mining topaz near Ouro Pr๊to, 1938. Photo: Edward SwobodaIn addition, nearly all larger crystals are heavily flawed and contain little if any cutting material. An exceptionally large and rich golden brown topaz is in the collection of the Los Angeles County (California) Natural History Museum. It is 28 centimeters long.Wood-burning train leaving Governador Valadares for Belo Horizonte and Ouro Pr๊to, 1953. Photo: Peter BancroftOuro Pr๊to has consistently been the world’s major source of golden topaz. Tons of crystals have been mined in the low hills west of town, but only a very few out of each 1000 crystals produce a facet-grade gem weighing more than one gram. Rare crystals with transparent sections of a remarkable sherry or muscatel color sometimes occur and a few produce flawless 100-carat stones of incredible beauty. When peach-hued prisms are placed in ovens and heated, a fraction of them change to pink. This color transition is permanent – but at the risk of fracturing the gems. Old topaz workings at Saramenha, ca. 1976.Photo: Wendell WilsonThe 4- to 6-kilometer-wide topaz mining zone extends from Mariana in the east to Sao Juliao in the west, a distance of about 44 kilometers. Most golden topaz occurs within this zone. Outstanding individual mines have been the Lavra do Moraes, Vermelhao, Lavra do Trino, Lavra do Capใo, and the Antonio Pereira. Ouro Pr๊to, 1977. Photo: Helmut LeithnerGem crystals occur in kaolinite clays (some stained by iron), penetrated by quartz veins. Topaz crystals also are commonly found in sedimentary iron formations composed chiefly of hematite and silica, known in Brazil as itabirite. Much of the original country rock has been eroded and reformed into a light conglomerate. If pegmatites ever existed in the Ouro Pr๊to region, little remains of them now. There is an absence of tantalum minerals, and pegmatitic minerals such as feldspar, mica, and heavy “native” tin.Topaz matrices form in two types: crystals imbedded in limonite and crystals attached to white quartz. The latter are quite rare, and topaz terminations are frequently damaged during the mining process. Doubly terminated topaz crystals occur uncommonly in the region but are frequently found at the Vermelhao mineAdd Certificate for Your GemstoneEMIL Gem Laboratory (Japan) Brief Report $20.00EMIL Gem Laboratory (Japan) Brief Report with Photo$25.00EMIL Gem Laboratory (Japan) Full Report with Photo $50.00AIGS Gemstone Identification Card Report with Photo $35.00AIGS Gemstone Identification Full Report with Photo $100.00BGL | Burapha Gemological Laboratory Brief Report $15.00BGL | Burapha Gemological Laboratory Brief Report Photo $20.00BGL | Burapha Gemological Laboratory Full Report Photo $50.00GIT | Gem and Jewelry Institute of Thailand Card Report $50.00GIT | Gem and Jewelry Institute of Thailand Full Report $80.00GIA| Gemological Institute of America Full Report $170.00GRS | Gemresearch Swisslab Full Report with Photo $170.00 Click Reload to UpdateHonesty Is our Policy We Deliver only QualityTOPAZ:Topaz is the gemstone representing the 4th and 19th wedding anniversaries. The name topaz comes from Topazios; an island in the Red Sea. In 15th century Rome, topaz was used to detect poisons, calm anger, and break spells. Christian's believed topaz stood for uprightness; and to Hindu's, topaz worn above the heart prevented thirst and assured long life, beauty, and intelligence. The Greek's felt topaz gave them strength and was used as an amulet against harm.Care Tips of Topaz Clean with warm soapy water. Avoid mers, strong heat and sudden changes of temperature. Topaz is relatively hard, but cracks easily when dropped or knocked.More information about Gemstone Please Click HereFeedback Award Thailand 2006Color grading for web | Clarity Scale | Shape| Treatment and Enchantment | Hardness | Refractive index | BirthstoneCopyright © 2007 Thaigemstore
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