The basics of diamond grading
Diamond grading is the grouping or arrangement of diamond qualities in relation to the 4Cs’ of a diamond.
Image courtesy of gia.edu
These are; cut, clarity, color & carat.
Certification has been recently added and a welcome addition it is!! So in effect, there are now 5Cs’ in total.
The diamond cut shows off a diamonds fire and brilliance.
The clarity of a diamond shows the presence or lack of inclusions…..these are either carbon spots or small cracks.
The diamond color deals mainly with how ‘white’ or not it is. Whiteness being the lack of color ranging from grade ‘D’ being whitest and ‘Z’ being most Yellow.
The diamond color which is quite important & can be quite confusing and is only determine by experts in accredited bodies.
One of the most famous being the GIA (Gemmological Institute of America).
This is because they are trained and have “master stones” which they use as benchmarks while grading.
The carat is a measure of a diamonds weight. 1 carat being equal to 5 grams or 100 ‘points’.
This figure is correct on paper but doesn’t strictly apply in the industry.
This is especially so when converting rough diamond value to cut diamond value due to the 50% loss you experience during the cutting process.
The more a diamond qualifies to the left of one or all of the categories above, the rarer and the more costly it will be.
Meaning if a diamond has a D color, is internally flawless, is 2 carats in weight and has an ideal cut, and has a diamond certificate from the GIA or EGL it can fetch up to…..wait for it $67,000 per carat.
The total cost for the stone being $134,000; that’s more than the annual salary of most senior engineers.
A diamond certificate is a document showing the above diamond qualities i.e. cut, clarity, color and carat for any diamond you buy.
The certificate has to be issued by a recognised institute e.g. GIA…..Gemmological Institute of America. Or the American Gemmological Laboratory (AGL)
Grading is an important part of buying a diamond ring and we’ll go in to detail to understand it better.