Ruby other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions may indicate that the stone has been treated. Ruby is the traditional birthstone for July and is usually more pink than garnet, although some rhodolite garnets have a similar pinkish hue to most rubies. The world's most valuable ruby is the Sunrise Ruby. Rubies have a hardness of 9.0 on the Mohs scale of mineral hardness. Among the natural gems only moissanite and diamond are harder, with diamond having a Mohs hardness of
Black Prince's Ruby and Henry nearly lost the helmet, along with his life. The battle was won by Henry's forces and the Black Prince's Ruby was saved. Richard III is supposed to have worn the gemstone in his helmet at the Battle of Bosworth, where he died. Henry VIII's inventory of 1521 mentions "a great balas ruby" set in the Tudor Crown, thought to be the Black Prince's Ruby. It remained there until the time of Oliver Cromwell in the 17th century. With the exception of the Coronation Chair and several other items, Cromwell had the principal symbols of the king's power –