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4ct Amethyst (Round, 10.89×10.89mm, Violet) vs 4ct Emerald (Round, 10.82×10.82mm, Green)


Quick summary: When looked from above (face-up position), 4ct Amethyst (10.89×10.89mm, round cut) appears 1% larger than 4ct Emerald (10.82×10.82mm, round cut). See below how they compare side-by-side on a ring and finger.

4ct Amethyst (round cut)
vs
 4ct Emerald (round cut)
violet
 
green
10.89×10.89 mm 10.82×10.82 mm
actual size
Actual size of 4ct Amethyst (round cut, 10.89×10.89mm, Violet color)   Actual size of 4ct Emerald (round cut, 10.82×10.82mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Violet 4ct Amethyst (round cut, 10.89×10.89mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 4ct Emerald (round cut, 10.82×10.82mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 65% vs 65%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Amethyst Round (10.89×10.89mm, Violet) and 4ct Emerald Round (10.82×10.82mm, Green) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

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

Face-up Size

All things being equal, Emerald will face-up slightly smaller than Amethyst for a given carat weight, because it has higher specific gravity (2.72 vs. 2.65 - this means it's "slightly heavier" compared to Amethyst of the same size). Face-up size also depends heavily on the proportions of the cut.

Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.


4 Ct Amethyst (Round) 4 Ct Emerald (Round)
10.89×10.89 mm vs 10.82×10.82 mm
93.14 mm²   91.95 mm²
Face-up size outline for 4ct Amethyst (10.89×10.89mm, round cut)
Face-up size outline for 4ct Emerald (10.82×10.82mm, round cut)
4ct Amethyst Round (10.89×10.89mm)
4ct Emerald Round (10.82×10.82mm)
Difference: 1% (1.19 mm²)
4ct Amethyst (Round, 10.89×10.89mm) has approx. 1% more face-up area than 4ct Emerald (Round, 10.82×10.82mm).


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