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Orange topaz, also known as precious topaz, is the birthstone for the month of November, the symbol of friendship, and the state gemstone of the U.S. state of Utah. [24] Blue topaz is the state gemstone of the US state of Texas. [25] The 4th wedding anniversary gem is blue topaz and the 23rd is imperial topaz. [22]
American Golden Topaz, the largest cut yellow topaz, weighing nearly 23,000 carats (4.6 kg). Chalmers Topaz , a 5,899.5-carat (1.17990 kg) cut topaz. Tsavorite
Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments.
The American Golden Topaz, housed in the National Museum of Natural History, Washington D.C.. The American Golden Topaz, a 172-faceted topaz weighing 22,892.5 carats (4.57850 kg; 10.0939 lb), is the largest cut yellow topaz in the world, and one of the largest faceted gems of any type in the world. [1]
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.