Standing closely behind Sapphire, Blue Topaz is the second famous gemstone in the world. The popularity of the stone is not surprising, as it comes in an array of striking hues along with a strong promise of durability. Blue Topaz is considered somewhat similar to Aquamarines. Going back in time, it is symbolized as a gem of healing and peace. More than two centuries ago, Romans discovered the stone in the Red Sea on the island of Topazios. In Rome, Topaz was believed to be a gem that combats evil and brings reconciliation.
Blue Topaz is quite rare and most commonly it is obtained by heating, irradiating a colorless topaz.
Color- Sky Blue, Swiss Blue, and London Blue
Refractive Index- nα = 1.606–1.629; nβ = 1.609–1.631; nγ = 1.616–1.638
Deposits- Brazil, Nigeria, Sri Lanka, India, China