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american-golden-topaz

Record: The Largest-Cut Yellow Topaz In The World

The American Golden Topaz currently holds the record for the largest piece of cut yellow topaz in the world.  More importantly, it is one of the largest faceted gems of any kind.  It is sized at 22,892 carats (4.5785 kg) and has 172-facets (flat-faced cuts applied to gems, in order to help them reflect light.) The gem was cut from a piece of yellow topaz that was 11.8 kg (26 lb) in size.  The original mineral was discovered in the Minas Gerais, Brazil, and cut by Leon Agee over a period of two years.  In 1988, the American Golden Topaz was donated to the Smithsonian Institute, and put on display in the National Museum of Natural History in Washington, D.C.  The price of the gem remains unclear.

aurora-australis

Record: The Largest And Most Valuable Opal

In 1956, the largest and most valuable opal in the world was found at the Eight-Mile opal field, in the mining town of Coober Pedy in South Australia. It was discovered at a depth of 9.144 meters (29 feet,) and was named the Olympic Australis opal, due to the Olympic Games being held in Melbourne at the time.  It weighs a remarkable 17,000 carats (3450 grams,) and is 99% gem quality.

In 2005, the Olympic Australis was valued at AUD $2.5 million.  Due to the purity of the jewel, it has been estimated that over 7,000 carats could be cut from the rough stone but, since the rock is so unique, it will be left in its natural organic state.  Currently, the Olympic Australis is kept in Melbourne, at the offices of Altmann & Cherny Ltd.

strawn-wagner-diamond

Record: The Only Diamond To Receive A Perfect AGS Grade Of 0/0/0

Crater of Diamonds is a US State Park located in Pike County, Arkansas. In 1990, the most marvelous discovery ever made there, was made when Shirley Strawn found the Strawn-Wagner Diamond.  Originally, the diamond weighed 3.09 carats (620 mg) but, after it was cut to a size of 1.09 carats (220 mg), it was given a perfect AGS grade of 0/0/0 by the Gemological Institute of America, indicating no flaws in cut, color, and clarity.  It was the first time in history that a diamond had received a perfect AGS grade.  According to AGS Laboratory Director Peter Yantzer, the diamond is one of the rarest in the world and a one-in-a-billion discovery.  It is currently on display at the Crater of Diamonds State Park.