The Stewart Sapphire, which had been owned by the Royal House of Scotland for centuries, was given to George III. The original owner of the sapphire was reputed to have been King Alexander II of Scotland, who had it set in the crown for his coronation in
Any visit to London requires a visit to the Tower of London, the Jewel House to see the English Crown Jewels. There you will find the Royal Regalia as used on Royal occasions by HM the Queen. There are also Royal jewels of past monarchs.
The Darya-i-Nur Diamond~~ considered to be the most celebrated diamond in the Iranian Crown Jewels and one of the oldest know to man. It weighs It's name means Sea of Light, River of Light or Ocean of light. It's a 'taviz' cut diamond.
In the Great Star of Africa was given to King Edward VII of England and set into the Royal Scepter. The Royal Scepter is still used today by Queen Elizabeth It is one of the largest polished diamonds in the world.