20 Carat Aquamarine (Oval, 23.67×15.78mm, Light Blue)

Color:

light blue

actual size

Actual size is set for screen

How big is a 20 carat oval-cut Aquamarine?

It depends on the cut parameters and length-to-width ratio, but a typical size of a 20ct oval-cut Aquamarine would be around 23.67×15.78 mm (±6%). The lw ratio of this Aquamarine is 1.5. See below 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	94 %

Saved...

Ring diameter: 16.9 mm

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Additional Info

Aquamarine is a blue to blue-green variety of beryl. The name comes from Latin "aqua marina" and means "water of the sea". The most valuable stones are those with the richest color saturation.

Where to buy?

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

Gem Details

Name:	Aquamarine
Mineral Group:	Beryl
Shape:	Oval
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:	23.67 mm
Width:	15.78 mm
Est. face-up size:	306.28 mm²
Volume:	1470.59 mm³
Length-to-width ratio:	1.5
Refractive Index:	1.57 - 1.58
Luster:	Vitreous
Wearability:	Excellent
Care Instructions:	No special care
Color:	Aquamarine can be found in the following colors:
Birthstone:	Aquamarine is a birthstone for the month of March

Popular comparisons:

About Aquamarine Specific Gravity

Aquamarine has a specific gravity of approximately 2.68 - 2.74, with 2.72 being a generally accepted standard average for gem-quality material.

For all the Aquamarine 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 Aquamarine vs Diamond (Oval Cut)

If you want to compare oval-cut Aquamarine sizes from 0.25 to 40ct on one page, see Oval Cut Aquamarine 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).