Diamonds are not only a girl’s best friend, they are also the hardest material on the planet. Right behind diamonds is sapphire. This means that a diamond laden $30,150 version of the Apple Watch includes the hardest and the second hardest materials on earth. There are eight rows of high-grade 15 carat diamonds on this luxury version of the Watch, which also comes with the usual sapphire glass display that Apple uses on the device. Mervis Diamond, the jeweler behind this glitzed up version of the Apple Watch, is using an 18K rose gold frame for the wearable.