Jewellers of Birmingham - Diamond Engagement Ring and Wedding Ring Specialists

Our Certified Diamonds

Diamond Certification

A diamond certificate is a process of grading of a diamond by an independent company. A certificate includes all the details of the diamond such as the dimensions, clarity, polish, cut, symmetry and other characteristics.

Diamond grading involves evaluating the qualities of an individual diamond and deciding how its qualities reflect its rarity and value. Diamond value is based on the Four C's: Cut, Clarity, Colour and Carat weight. In combination, these four factors provide a way to discuss diamonds and to compare one diamond to another.

  • Diamond Colour - In most diamonds, the term actually refers to the absence of colour. The less colour in the stone, the more desirable and valuable it is. Some of these differences are not visible to the naked eye, but directly impact the overall quality and price of the stone.
  • Diamond Claritymeasures the amount, size and placement of internal ‘inclusions,’ and external ‘blemishes.’ Grades run from ‘Flawless,’ with virtually no imperfections, to ‘Included,’ which contain a significant number of imperfections.
  • Diamond Cutdoes not refer to a diamond’s shape, but to the proportion and arrangement of its facets and the quality of workmanship. The amount of brilliance, sparkle and fire in a diamond is determined by cut. Grades range from ‘Excellent’ to ‘Poor.’
  • Diamond Carat - refers to a diamond’s weight. Generally speaking, the higher the carat weight, the more expensive the stone. Two diamonds of equal carat weight, however, can have very different quality and price when the other three Cs are considered.


When buying a certificated diamond you can guarantee that your diamond has been evaluated, measured and scrutinised by trained eyes.

Here is an example of a diamond certificate that you would get with your certificated diamond ring:

There are some diamond dossiers which provide a summary of the diamond along with the diamonds unique identification code which can be linked back to the grading laboratories database.

There are two main diamond certificate companies that we work with, these are the most recognised GIA (Gemmological institute of America) and IGI (International Gemmological Institute).


The above organisations do not buy, sell of give valuations of diamonds or other gems; they are there simply to give a certificate as to the quality of the diamonds they receive. This means there is no benefit in any way for them to wrongly classify a diamond as better than it actually is.

At G H Moore and Son we buy these diamonds already certified which means they may cost a little more than our good commercial quality range diamonds. We only use local well respected diamond dealers to ensure that the diamonds you are buying are completely conflict free.

At our store we are proud that Adele Moore has gone through extensive training and is now a GIA Graduate Gemologist, so she will ensure all diamonds we stock are the the highest standard. Please pop in store or give us a call to see what diamonds we currently have in stock, If we haven't got exactly what you're looking for, we can contact our suppliers and get a range of diamonds in for you to view. We can also get a selection of mounts in and can normally set the diamond on the same day.