The
American Golden Topaz, a 172-faceted topaz weighing 22,892.5 carats (4.5785 kg), is the largest cut yellow topaz in the world, and one of the largest faceted gems of any type in the world. Originating from minas gerais brazil,it was cut by Leon Agee over a period of two years from an 11.8 kg (26 ib avdp) stream-rounded cobble owned by Drs. Marie L. and Edgar F. Borgatta. It was contributed jointly by the Borgatta owners and by to the smithsonian insitution in 1988 and is displayed in the national musium of natural history in washington d.c.
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