Whether buying diamonds for a financial or emotional investment, knowledge is always the precursor to making the wisest choice. Professionals in the diamond industry use four categories to qualify and quantify these precious stones. Understanding this process will assist you in making an informed decision. Specifications of a particular diamond can be found in the accompanying diamond laboratory’s certificate. These laboratories screen the diamonds for imitations, synthetics or any other treatments. Diamonds are graded by qualified gemologists under controlled lighting using correct diamond equipment, providing the most accurate assessment.