The international unit of weight, used for measuring diamonds and gemstones. 1 carat is equal to 200 milligrams, or 0.2 grams.
D color: D is the highest color grade and is an extremely rare diamond since it is considered colorless.
E color: E has almost no color that can only be detected by a gemologist, and is a rare diamond.
F color: F is still considered colorless with only a very slight hint of color, and is rated a high quality diamond.
G color: G is a high quality diamond that is nearly colorless.
H color: H is a high quality diamond that is nearly colorless.
I color: I has only a slight hint of color and is rated a top value.
J color: J has slightly more color and is rated a top value.
K-Z color: These diamonds may appear yellow or slightly brown depending on the cut grade.
Flawless: Flawless: No internal or external flaws. Extremely Rare.
Internally Flawless: Internally Flawless: no internal flaws, but some surface flaws
VVS1-VVS2: Very Very Slightly Included (two grades). Minute inclusions very difficult to detect under 10x magnification by a trained
VS1-VS2: Very Slightly Included (two grades). Minute inclusions seen only under 10x magnification.
SI1-SI2: Slightly Included (two grades). Minute inclusions more easily detected under 10x magnification.
I1: Included. Diamonds may have minor eye-visible inclusions. RIO offers a limited selection of jewelry with I1 clarity diamonds.
- Very Good
Excellent cut: Excellent cut reflects most of the light and is an exceptional quality diamond.
Very Good cut: Very good cut reflects most of the light and is considered an excellent value.
Good cut: Good cut grade reflects a good amount of light, although less than a very good cut grade.
Fair cut: Highest cut grade. Its proportions produce a beautiful balance of fire and sparkle in a diamond.
The height of a diamond, measured from the culet to the table, divided by its average girdle diameter. One of the basic proportions that contributes to a diamond's appearance, brilliance and fire.
The overall condition of a finished diamond's faceted surfaces, including how smoothly the facets have been polished, whether any marks are visible from the polishing wheel, and how defined the edges of each facet are. Polish marks are almost always invisible to the unaided eye, but good polish is essential for maximum light performance.
The width of the diamond's table expressed as a percentage of its average diameter. A component of the overall cut grade, this measurement is critical to a diamond's light performance.
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- Carat Weight
- Depth %
- Table %
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