GIA diamond is really shorthand diamond sellers use to describe diamonds that have been graded by GIA. GIA is an independent, nonprofit organization that conducts gem research, educates gem professionals, and sets the standards for determining diamond quality.
One of GIA’s main functions is the grading of diamonds. You may have already heard or learned about the 4Cs of diamond quality: color, clarity, cut, and carat weight. GIA created this standard, along with the scientific procedures for evaluating each “C” and the grading terminology used to describe them.
Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip.
Diamond price increases with diamond carat weight because larger diamonds are rarer and more desirable. But two diamonds of equal weight can have very different values depending on the other members of the Four C’s: clarity, color and cut. The majority of diamonds used in fine jewelry weigh one carat or less.
GIA’s color-grading scale for diamonds is the industry standard. The scale begins with the letter D, representing colorless, and continues with increasing the presence of color to the letter Z, or light yellow or brown. Each letter grade has a clearly defined range of color appearance.
Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth. This process can result in a variety of internal characteristics called ‘inclusions’ and external characteristics called ‘blemishes.
The GIA Diamond Clarity Scale has 6 categories, some of which are divided, for a total of 11 specific grades.
Flawless (FL) – No inclusions and no blemishes visible under 10x magnification
Internally Flawless (IF) – No inclusions visible under 10x magnification
Very, Very Slightly Included (VVS1 and VVS2) – Inclusions so slight they are difficult for a skilled grader to see under 10x magnification
Very Slightly Included (VS1 and VS2)- Inclusions are observed with effort under 10x magnification, but can be characterized as minor
Slightly Included (SI1 and SI2) – Inclusions are noticeable under 10x magnification
Included (I1, I2, and I3) – Inclusions are obvious under 10x magnification which may affect transparency and brilliance
A round brilliant cut diamond has 57 or 58 facets, the 58th being a tiny flat facet at the bottom of the pavilion that’s known as the culet.
The GIA Cut Grading System applies to the most popular cutting style – the standard round brilliant, and all clarities across the D-to-Z color range. There are five cut grades: Excellent (EX), Very Good (VG), Good (G), Fair (F), and Poor (P).
Facets are the key to a diamond’s cut quality. Their angles, size, and arrangement to each other, as well as the quality of their surfaces in addition to other factors, are critical in delivering that sparkle you expect to see when looking at a diamond face up.
TIP: Ex Ex Ex or Triple Ex: You’ll hear these terms to describe diamonds with an Excellent overall cut grade, and Excellent polish and Symmetry grades.
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Wisma Atria Outlet
435 Orchard Road, #B1-28 Wisma Atria,
Singapore 238877
Tel : 6694-1663
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Bugis Junction #01-22/22A, 200 Victoria Street,
Singapore 188021
Tel : 6250－9962
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50 Jurong Gateway Road, JEM #01-54,
SINGAPORE 608549
Tel : 6659-6100
TAMPINES ONE Outlet
10 Tampines Central 1, Tampines One #01-35
SINGAPORE 529536
Tel : 6481-2042
