There are two kind of black diamonds, enhanced and none enhance they both a natural mined black diamond. The enhanced is opaque the none enhanced is kind of transparent. Most of the color enhanced black diamonds are not perfect they have some imperfections. The none enhanced ones are very rare and are much more expensive. If you would like to buy a top quality enhanced or none enhanced black diamond I would recommend buying it with a certificate from a serious gemological institute. For more questions please contact me.