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Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]
The DeLong Star Ruby - a 100-carat stone discovered in Burma in the 1930s. The Patricia Emerald - a 12-sided 632-carat emerald found in Colombia in 1920, unique because it was never cut into a gem shape. [2] The Brazilian Princess Topaz - a light blue gemstone weighing 9.5 pounds, considered to be the largest cut gemstone in the world. [15]
Blue topaz; Precious topaz; Imperial topaz; Misnomers. Occidental topaz a misnomer for yellow quartz. Brazilian aquamarine a misnomer for Topaz; Indian topaz a misnomer for yellow corundum; Nevada topaz a misnomer for smoky obsidian. Madeira topaz a misnomer for citrine; Scotch Topez a misnomer for citrine, smoky quartz or cairngorm
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
Minerals of note in the city are: gold, hematite, dolomite, tourmaline, pyrite, muscovite, topaz and imperial topaz, which is a stone only found in Ouro Preto. Soapstone handicraft items are a common souvenir among tourists, and can be found in many shops in the city's town centre and street fairs.
An 836-pound “cursed” emerald worth nearly $1 billion will be returned to Brazil after 15 years under lock and key in Los Angeles. The 180,000-carat Bahia Emerald was smuggled out of the South ...
Rare or unusual gemstones, generally understood to include those gemstones which occur so infrequently in gem quality that they are scarcely known except to connoisseurs, include andalusite, axinite, cassiterite, clinohumite, painite and red beryl. [27] Gemstone pricing and value are governed by factors and characteristics in the quality of the ...
The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...