The Perot Museum of Nature and Science is introducing a new exhibit: Topaz: A Spectrum in Stone. The exhibit highlights ... The exhibit also boasts a 15-pound blue topaz from Brazil and etched ...

A flawless blue topaz gemstone - the largest of its kind - will be displayed in the Museum's Minerals gallery from 19 October. The Ostro stone is the largest cut topaz to go on show at the Museum.