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.

Topaz, also known as the “lover of gold,” is said to bring wealth and money. Citrine, on the other hand is said to be the stone of prosperity, wealth, protection and good luck.

The topaz is accompanied by a $5 million gift from Whitney to endow the Coralyn W. Whitney Curator of Gems and Minerals. “We are indebted to Coralyn Wright Whitney for her generosity and her ...