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Gemstone 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.

Gemstone color

Choose a color grade:
  • D
  • E
  • F
  • G
  • H
  • I
  • J
  • K-Z
D color: D is the highest color grade and is an extremely rare gemstone since it is considered colorless.
E color: E has almost no color that can only be detected by a gemologist, and is a rare gemstone.
F color: F is still considered colorless with only a very slight hint of color, and is rated a high quality gemstone.
G color: G is a high quality gemstone that is nearly colorless.
H color: H is a high quality gemstone 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.

Gemstone clarity

Choose a color grade:
  • F
  • IF
  • VVS1-VVS2
  • VS1-VS2
  • SI1-SI2
  • I1
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.

Gemstone cut

Choose a color grade:
  • Excellent
  • Very Good
  • Good
  • Fair
Excellent cut: Excellent cut reflects most of the light and is an exceptional quality gemstone.
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 gemstone.

Depth percentage

The height of a gemstone, measured from the culet to the table, divided by its average girdle diameter. One of the basic proportions that contributes to a gemstone's appearance, brilliance and fire.


The overall condition of a finished gemstone'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 gemstone's table expressed as a percentage of its average diameter. A component of the overall cut grade, this measurement is critical to a gemstone's light performance.
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221, Mount Olimpus, Rheasilvia, Mars,
Solar System, Milky Way Galaxy
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