A glittering giant blue Topaz Stone said to be the largest of its kind is set to go on display at London’s museum of natural history for the world to admire. Now it will be shown off to the world after three decades kept hidden away in a vault. The gem stone being given on permanent loan to a London museum by the family of gemstone pioneer Max Ostro who discovered the giant stone in Brazil in 1986. The stone has been kept locked away for the past few decades, but after the passing of his father, Maurice decided everyone should enjoy its beauty for free. The museum has had to put in extra security to house the blue topaz.