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4ct Amethyst (Cabochon, 12.47×8.31mm, Violet) vs 2.26ct Diamond (Oval, 10.65×7.1mm, White)


Quick summary: When looked from above (face-up position), 4ct Amethyst (12.47×8.31mm, cabochon cut) appears 37% larger than 2.26ct Diamond (10.65×7.1mm, oval cut). See below how they compare side-by-side on a ring and finger.

4ct Amethyst (cabochon cut)
vs
 2.26ct Diamond (oval cut)
violet
 
white
12.47×8.31 mm 10.65×7.1 mm
actual size
Actual size of 4ct Amethyst (cabochon cut, 12.47×8.31mm, Violet color)   Actual size of 2.26ct Diamond (oval cut, 10.65×7.1mm, White 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
White 2.26ct Diamond (oval cut, 10.65×7.1mm) 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 43%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 4ct Amethyst Cabochon (12.47×8.31mm, Violet) and 2.26ct Diamond Oval (10.65×7.1mm, White) 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, Diamond will face-up smaller than Amethyst for a given carat weight, because it has higher specific gravity (3.52 vs. 2.65 - this means it's "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) 2.26 Ct Diamond (Oval)
12.47×8.31 mm vs 10.65×7.1 mm
84.97 mm²   62 mm²
Face-up size outline for 4ct Amethyst (12.47×8.31mm, cabochon cut)
Face-up size outline for 2.26ct Diamond (10.65×7.1mm, oval cut)
4ct Amethyst Cabochon (12.47×8.31mm)
2.26ct Diamond Oval (10.65×7.1mm)
Difference: 37% (22.97 mm²)
4ct Amethyst (Cabochon, 12.47×8.31mm) has approx. 37% more face-up area than 2.26ct Diamond (Oval, 10.65×7.1mm).


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