20 Carat Emerald (Cushion, 17.09×17.09mm, Green)

Color:

green

actual size

Actual size is set for screen

How big is a 20 carat cushion-cut Emerald?

It depends on the cut parameters and length-to-width ratio, but a typical size of a 20ct square cushion-cut Emerald would be around 17.09×17.09 mm (±6%). Check how big it looks on a ring and finger.

Ring:

Gold
Platinum

Skin tone:

Pale
Light
Medium
Dark

Ring width: 3.0 mm

Saved...

64 mm

Your settings
Ring	Gold
Skin tone	Light
Ring diameter	16.9 mm
Ring width	3.0 mm
Finger length	64 mm
Finger coverage	102 %

Saved...

Ring diameter: 16.9 mm

USA	UK	Asia	EU1	EU2

Additional Info

Emerald is a green variety of Beryl mineral family. Its name comes from the French word "esmeralde", which came from the Greek word "smaragdos". The latter basically means "green gemstone". The most important factor in emerald's value is its color (vivid green is valued the most). The color in Emerald is caused by the presence or absence of chromium, vanadium, and iron.

Where to buy?

For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Gem Details

Name:	Emerald
Mineral Group:	Beryl
Shape:	Cushion
Chemical Formula:	Be₃Al₂Si₆O₁₈
Crystal Structure:	Hexagonal
Hardness:	7.5 - 8.0
Specific Gravity	2.72
Carat weight:	20 ct
Gram weight:	4 g (0.1411 ounces)
Points:	2000 pts
Length:	17.09 mm
Width:	17.09 mm
Est. face-up size:	262.86 mm²
Volume:	1470.59 mm³
Length-to-width ratio:	1
Refractive Index:	1.57-1.58
Luster:	Vitreous
Wearability:	Excellent
Care Instructions:	No special care
Color:	Emerald can be found in the following colors:
Birthstone:	Emerald is a birthstone for the month of May

Popular comparisons:

About Emerald Specific Gravity

Emerald has a specific gravity of approximately 2.67 - 2.78, with 2.72 being a generally accepted standard average for gem-quality material.

For all the Emerald size calculations on this website, the specific gravity of 2.72 is used.

To learn more about it and why it matters, and to compare densities of all the gemstones on one page, click here.

Ring & Finger Simulator

Use the simulator on this page to play around with different ring and finger configurations.

To select a different gemstone, shape, color or size, or to compare two gems side-by-side, use the form at the top of the page. Comparison example: 20ct Emerald vs Tsavorite (Cushion Cut)

If you want to compare cushion-cut Emerald sizes from 0.25 to 40ct on one page, see Cushion Cut Emerald Size Chart

In order to view real-world sizes on your screen, ensure that the actual size is set to your device screen size (diagonal in inches).