Emerald Cut Diamonds Assessment Chart Guide In-depth Information

Emerald Cut Diamonds Assessment Chart Guide In-depth Information

Emerald Cut Diamonds Assessment Chart Guide In-depth Information

Posted by Sear R. on 24th Jun 2018

Evaluating Emerald Cut Diamonds


emerald cut diamond

Be sure to check out our loose diamond filter to compare actual prices. 

Emerald Cut Diamonds:

Cutting diamonds into an emerald shape dates back to 13-14th century when diamonds were beginning to make its way to the popular culture. The modern emerald cut diamond has 58 facets, roughly 25 on the crown, 25 on the pavilion, and 8 on the girdle with 3 rows of bottom steps and three rows of top steps. These luminous gems feature step-cut (or trap-cut) because it has rows of facets which is different from other fancy cut shapes. These facets are arranged in rectilinear style parallel to the girdle, typically in a staircase form, hence the name step-cut.

Usually, the corners of diamonds are the weakest points for a typical stone, but emerald cut diamonds beautifully addresses this concern. In addition, the emerald cut diamond features a keel running through the pavilion terminus which is not available in other diamond cuts.

During the Art Deco period, many of the antique jewelry pieces featured step-cut styles which is why today diamond lovers are keen to recapture the aesthetics of that time period. If you love the classic style typically found in antique jewelry, choosing an emerald cut diamond wont be a bad idea.

Analyzing Cut - ideal proportions:

Depth %

Poor/Fair: <52.5 or > 80 / 74.6 - 80

Good: 57 - 59 / 71- 74.5

Very Good: 58-61/67.4-70.1

Excellent: 61.3 - 67

Table %

Poor/Fair: <50 or >80/50-52.5 or 75.5-80

Good: 53-57/74

Very Good: 58-61/71

Excellent: 62-70


Poor/Fair: Very Large/Large

Good: Slightly large

Very Good: Medium/Very Small

Excellent: None


Poor/Fair: Ex. Thin – Ex. Thick

Good: Very thin - thick

Very Good: Very thin - slightly thick

 Excellent: Very thin - slightly thick

Length to Width Ratio for Square Shape

Poor/Fair: >1.09 /1.07-1.09

Good: 1.05-1.06

Very Good: 1.00-1.04

Excellent: 1.00-1.04

Length to Width Ratio for Rectangular Shape

Poor/Fair: >1.90 /1.81-1.90

Good: 1.20-1.29/1.63-1.80

Very Good: 1.30-1.38/1.51-1.70

Excellent: 1.39-1.50

The chart above serves as a general guideline when evaluating the cut of an emerald cut diamond. The length to width ratio of 1.50 is considered the classic cut for a rectangular shaped emerald cut diamond. However, the recent trend is towards a more square shape with ratio of 1.30. Consult with Petra Gems for precise measurements and length to width ratio of these elegant diamonds.

Evaluating Color:

Just like evaluating the color in other diamond shapes, color in an emerald cut diamond is critical. The higher the color grade, the better. In our experience, many buyers prefer the warmer colors over the colorless colors given the difference in price. In the color spectrum, the warmer colors refer to the near colorless range of G-I color diamonds while the colorless colors refer to D-F color diamonds. The price premium for a lower color grade emerald cut diamond would be significantly lower. Since the body of emerald cut diamonds is large and contains open facets, choosing a higher color grade is recommended when buying an emerald cut diamond.

For more detailed information on the color of emerald cut diamond, use the table below.

< 0.50 Carat

Poor/Far: >M/ L-M

Good: I

Very Good: G-H

Excellent: D-G

0.51 – 1.0 Carat

Poor/Fair: J-K / >L

Good: I

Very Good: H

Excellent: D-G

1.0 – 2.0 Carat

Poor/Fair: H-I / >I

Good: J/I

Very Good: G-H

Excellent: D-F

>2.0 Carat

Poor/Fair: H-I / >I

Good: H-I

Very Good: F-G

Excellent: D-E


Poor/Fair: Very Strong

Good: Strong

Very Good: Medium/Faint

Excellent: None

Choosing Clarity

Since Emerald cut diamonds have open facets, it is recommended to buy a slightly higher clarity emerald cut diamond. Each of our customers have a unique standard for clarity and color. Some of our customers want a flawless diamond while others are perfectly comfortable with inclusions as long as they are not noticeable to the naked eye. GIA provides excellent help with their clarity grades, so you can use it to choose an emerald cut diamond that will meet your standards.

SI1 would be a great balance of price and appearance in an emerald cut. You can also consider buying VS2 for a comparable choice.

< 0.50 Carat

Poor/Far: >I1/ I1

Good: SI1-SI2

Very Good: SI1-SI2

Excellent: FL-VS1

0.51 – 1.0 Carat

Poor/Fair: I1-I3

Good: SI1-SI2

Very Good: VS2-SI1

Excellent: FL-VS1

1.0 – 2.0 Carat

Poor/Fair: I1 / >I1

Good: SI2

Very Good: SI1/ VS2

Excellent: FL-VS1

>2.0 Carat

Poor/Fair: I3/II1

Good: SI2

Very Good: SI1/VS2

Excellent: FL-VS1

Suggested carat weight, cut, color and clarity of Emerald Cut Diamond for people with budget constraints:

Excellent Choice:

  • At least 1.0 carats in Weight
  • Very Good to Excellent Polish and Symmetry
  • G or above in color
  • SI1 or above in clarity
  • No Florescence
  • Length/width ratios: 0.95 - 1.05 for square or 1.5 to 1.60 for a rectangular shape

Very Good Choice:

  • At least 0.90 carats in Weight
  • Good to Excellent Polish and Symmetry
  • H or above in Color
  • SI1 or above in Clarity
  • None, faint or medium blue florescence
  • Length/width ratios: 0.95-1.05 for square or 1.45 to 1.65 for rectangular shape

Good Choice:

  • At least 0.80 Carats in Weight
  • Good to Very Good Polish and Symmetry
  • I or above in Color
  • SI1 or above in Clarity
  • None, faint or medium blue florescence
  • Length/width ratios: 0.95-1.05 for square or 1.4-to 1.68 for rectangular shape

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