Editor's note: The De Beers Group had the idea of spinning its product—diamonds—as a symbol of love and commitment, and boy did it work! Ever since 1947, when they coined the slogan “A Diamond Is Forever,” men have been getting down on their knees to present their ladies with a big sparkly rock while saying the words, “Will you marry me?” And if that marriage doesn’t work out, keep the diamond, girls: the gem’s durability makes it a fantastic family heirloom. Enjoy some stunning Diamond wallpapers!