Yes, your diamond existed 100 miles below the Earth's surface for millions of years before it came to decorate your jewelry. And yes, diamonds are used in high-powered drills to dig deep into the earth- they have been through a lot and will stand up to years of everyday abuse. However, if you want to keep your diamond shining as beautiful and lustrous as it did on the first day you got it, you have to take care of it. - Store your diamond jewelry separate from your other jewelry. Your diamonds will scratch other gems and damage each other if stored improperly. - When cleaning your diamond jewelry, be sure to use a jewelry cleaner that does not contain any harsh chemicals that could harm either your gemstone or the setting. - Don't use a hard brush to clean your diamond; though the diamond won't be damaged, the setting may be. Use a soft brush to clean off any buildup that can't be removed by other techniques.