Excuse me guys, it’s not Valentine’s, it’s not even my birthday … I don’t know what urge made me bring you today this article about the most beautiful rocks on the planet and the best friends of the girls – the diamonds – but enjoy theese beauties: These seven diamonds are among the most rare and valuable in the world. They are being displayed together for the first and only time through the collaborative efforts of the Smithsonian Institution, The Steinmetz Group, and the Gemological Institute of America.