A certified diamond has been inspected and and graded and registered according to GIA (Gemological Institute of America) standards. A diamond grading report is issued showing a comprehensive analysis of the diamond.
Most diamond dealers should be able to tell you if a diamond is certified or not.
Kimberley Certified
A certified gemologist can determine whether your diamond is a natural diamond or a lab-created diamond.
Any diamond is 'good' when it can be certified as to its characteristics: cut, colour, carat weight and clarity. A certified gemologist can perform this work for you.
Take your diamond to a certified gemologist who can help you value the pieces.
A genuine diamond can be natural or lab-created. A certified gemologist can help you identify the source of your diamond, and whether the diamond is indeed a diamond.
Every diamond is worth what someone will pay you for it. A certified gemologist can help you understand your diamond's cut, colour, clarity and carat weight: every diamond is unique in these ways. Then, you'll have a basis upon which to set a price for your diamond.
This is an unusual designation. One Australian jeweler claims to be a 'certified diamond seller'. In a brief search, it's the only instance of the designation to be found online. Directly, the phrase is 'certified diamond seller'.
A certified diamond is one that has been evaluated by a professional in whatever certification method is documented by the certificate. For example, the Gemological Institute of America -- GIA -- certifies diamonds by documenting the colour, clarity, cut and carat weight of the diamond. This establishes the individual characteristics of the gem. A non-certified diamond can only be evaluated according to the expertise of the person evaluating the diamond, and usually without certification. It's characteristics, therefore, are uncertain.
Every diamond is valued according to its cut, colour, clarity and carat weight. A certified gemologist can help you evaluate your diamond.
According to the RIAA website:The first album to be certified as a diamond album was "Can't Slow Down" by Lionel Richie released in 1983 and certified in 1985 with 10 million sales.The earliest album that has been certified as diamond is "Sgt. Pepper's Lonely Hearts Club Band" by The Beatles, which was released in 1967, but wasn't certified diamond until 1997 with 11 million sales.
You can pay a certified gemologist to value the diamond and the setting, and give you the answer that you want.