Because we care about people in this world, we also want to make sure that our diamonds were no cause of harm to other people.
If that were the case, it would take away from the romantic value.
So how can you be sure that your diamonds is an ethical diamond?
Fortunately, blood diamonds are very rare. Diamond mining and trading of rough diamonds is strictly regulated by the UN body called the Kimberley process. So you can be sure that if you buy a polished diamond it is an ethical diamond.
If this is not good enough for you, consider buying a lab-grown diamond, or a diamond mined in Canada. You can read more about what the difference is between a lab-grown and natural diamond here. There are plenty of options.