Certification is essential in determining a diamond's value. A diamond certificate is issued to authenticate a diamond. In respects to the carat weight, colour and clarity. This is to ensure that all are validated alongside the diamond's precise measurements. Diamdirect.net diamonds have been graded by GIA, EGL, DIA Laboratories as the most popular.
Always buy a certificated diamond. If your diamond is not graded by an internationally recognised lab there are many unreliable companies who will attempt to self-grade diamonds. Be guarded enough to know that you are making a wise decision by questioning your certification to ensure that you do not fall prey to being an easily targeted victim.