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Diamond shape


  • Round
  • Princess
  • Emerald
  • Asscher
  • Cushion
  • Marquise
  • Radiant
  • Oval
  • Pear
  • Heart

Carat (ct.)


The international unit of weight, used for measuring diamonds and gemstones. 1 carat is equal to 200 milligrams, or 0.2 grams.

Diamond color


Choose a color grade:
  • D
  • E
  • F
  • G
  • H
  • I
  • J
  • K-Z
D color: Highest, absolutely "colorless" grade, appreciated best set in platinum or white gold. Exceptionally rare.
E color: A "colorless" grade appreciated best set in platinum or white gold. Traces of color difficult for even trained eye to detect.
F color: A "colorless" grade appreciated best set in platinum or white gold. Faint color detectable by a trained gemologist.
G color: The highest "near-colorless" grade. Color may be detectable when compared to much higher "colorless" grades. Excellent value.
H color: A "near-colorless" grade, color is only noticeable when compared to much higher color grades. Excellent value.
I color: The last of the "near-colorless" grades, color may be only slightly detectable upon close examination. Exceptional value.
J color: Color may be slightly detectable to the unaided eye, particularly in fancy shapes or diamonds over 1-carat.
K-Z color: Color is visibly subtle to distracting. RIO does not carry diamonds of these color grades.

Diamond clarity


Choose a color grade:
  • FL-IF
  • VVS1-VVS2
  • VS1-VS2
  • SI1-SI2
  • I1
  • I2-I3
Flawless: No internal or external characteristics. Internally Flawless: May have external blemishes only. Both extremely rare.
VVS1-VVS2: Very, very slightly included. Characteristics miniscule and difficult to see under 10x magnification, even to a trained eye.
VS1-VS2: Very slightly included. Minor inclusions ranging from difficult (VS1) to somewhat easy (VS2) to see at 10x magnification.
SI1-SI2: Slightly included. Inclusions noticeable at 10x. Best value if eye-clean. SI2 inclusions may be detectable to a keen unaided eye.
I1: Included. Diamonds may have minor eye-visible inclusions. RIO offers a limited selection of jewelry with I1 clarity diamonds.
I2-I3: Included. Will likely have more obvious or distracting inclusions. RIO does not carry I2-3 clarity diamonds.

Diamond cut


Choose a color grade:
  • Excellent
  • Ideal
  • Very Good
  • Good
Excellent cut: Precise proportions, polish, and symmetry allows the diamond to reflect the most possible light. Less than 1% of the world's diamonds qualify.
Ideal cut: Highest cut grade. Its proportions produce a beautiful balance of fire and sparkle in a diamond.
Very Good cut: Very slightly less measurable fire or sparkle than an ideal cut diamond, at a more affordable price.
Good cut: Quality at a lower price than a very good cut, still producing a beautiful diamond for the budget-minded.

Depth percentage


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.

Polish


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.

Table percentage


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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  • Cutinfo
  • Depth %info
  • Girdle From
  • Girdle To
  • Measurements
  • Polishinfo
  • Table %info
  • Symmetry
  • Fluorescence

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