When writing the grades of a diamond using the AGS Scale, diamond Cut grade is first, then diamond Color, Clarity, then Carat Weight—in that order. If a diamond possessing the finest diamond Cut grade is also colorless, free of inclusions and blemishes, and weighs one carat, it would be written as: 0/0/0–1.000 carat. Diamond clarity refers to the absence of these inclusions and blemishes. Diamonds without these birthmarks are rare, and rarity affects a diamond's value
Diamond carat is often misunderstood and refers to a diamond's weight, not necessarily its size. When comparing diamond carat sizes, take a diamond's cut into consideration as well: a high-carat diamond with a poor cut grade may look smaller, often cut deeper, than a diamond with smaller carat weight and a better cut. Use our buying tips, diamond carat size chart, and expert tips to help you choose the best diamond carat weight for you.
|Size Range||0.30 to 0.399||0.40 to 0.499||0.50 to 0.699||0.70 to 0.899||0.90 to 0.999||1.00 to 1.499||1.50 to 1.999||2.00 to 2.499||2.50 to 2.999||3.00 to 3.999||4.00 to 10.999|
Clarity is a term used for describing the number and size of inclusions in a diamond. Inclusions are mainly traces of non-crystallized carbon that may appear on the diamonds internally or externally. A flawless diamond contains no inclusion and is considered extremely rare and valuable. Large inclusions affect the brilliance of the stone as they interfere with the dispersion of light.
We grade diamonds on the basis of purity by determining following categories:
|Description||Flawless||Inernally Flawless||Very Very Slightly Include||Very Very Slightly Include||Very Slightly Included-1||Very Slightly Included-2||Slightly Included-1||Slightly Included-2||Slightly Included-3||Included -1|
If our (SGS) Clarity grading is VS-2 and laboratory gives us SI-1 certificate, we have to specify the exclusive clarity in the comment column.
If our (SGS) clarity grading is SI-1 and the laboratory gives us a VS-2 certificate, we have to specify the upgraded clarity in the comment column.
Diamonds close to being colorless are more rare and valuable. Diamonds that display little color allow more light to pass through, resulting in a burst of brilliance. On the basis of color, diamonds are allocated a grade, starting with D grade (for colorless diamonds) and ending in a Z+ grade. Some diamonds are also found in vivid colors such as red, blue and pink.
|SGS Color Grades||D E F||G H I J||K L M||N to R||S to Z|
|Parameters||Colorless||Near Colorless||Faint||Very Light||Light|
Cut gives a unique sparkle and brilliance to diamonds. Cut quality depends on the craftsmanship of the diamond cutter. If a diamond has perfect color and clarity but the cut is poor, it will lose its brilliance.
We grade diamonds on the basis of cut by determining following categories:
|SGS Color Grades||EX||VG||G||F|
|Description||Excellent Cut||Very Good Cut||Good Cut||Fair Cut|