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4ct Amethyst (Cabochon, 12.47×8.31mm, Violet) vs 1ct Emerald (Emerald, 7.28×5.39mm, Green)


Quick summary: When looked from above (face-up position), 4ct Amethyst (12.47×8.31mm, cabochon cut) appears 2.3 times larger than 1ct Emerald (7.28×5.39mm, emerald cut). See below how they compare side-by-side on a ring and finger.

4ct Amethyst (cabochon cut)
vs
 1ct Emerald (emerald cut)
violet
 
green
12.47×8.31 mm 7.28×5.39 mm
actual size
Actual size of 4ct Amethyst (cabochon cut, 12.47×8.31mm, Violet color)   Actual size of 1ct Emerald (emerald cut, 7.28×5.39mm, 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 (cabochon cut, 12.47×8.31mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 1ct Emerald (emerald cut, 7.28×5.39mm) 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
 50% vs 32%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Amethyst Cabochon (12.47×8.31mm, Violet) and 1ct Emerald Emerald (7.28×5.39mm, 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 (Cabochon) 1 Ct Emerald (Emerald)
12.47×8.31 mm vs 7.28×5.39 mm
84.97 mm²   36.49 mm²
Face-up size outline for 4ct Amethyst (12.47×8.31mm, cabochon cut)
Face-up size outline for 1ct Emerald (7.28×5.39mm, emerald cut)
4ct Amethyst Cabochon (12.47×8.31mm)
1ct Emerald Emerald (7.28×5.39mm)
Difference: 133% (48.48 mm²)
4ct Amethyst (Cabochon, 12.47×8.31mm) has approx. 133% more face-up area than 1ct Emerald (Emerald, 7.28×5.39mm). In other words, it's 2.33x larger.


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