Vintage Sapphire & Diamond Halo RingSapphire is one of the favorite gems of the European Royalty, in particular the British Royalty (remember the legendary crown of the Queen and the Lady Di halo ring?). Therefore it is no surprise where 'Royal Blue' derives its name from. The origin of the Halo ring goes back to the early Georgian era (1714 1837) with mostly round designs. Later on in the Victorian era, oval shapes became popular and were often made with a different stone in the middle