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0.4ct Diamond (Baguette, 5.33×3.55mm, White) vs 0.67ct Amethyst (Round, 6×6mm, Light Violet)


Quick summary: When looked from above (face-up position), 0.67ct Amethyst (6×6mm, round cut) appears 49% larger than 0.4ct Diamond (5.33×3.55mm, baguette cut). See below how they compare side-by-side on a ring and finger.

0.4ct Diamond (baguette cut)
vs
 0.67ct Amethyst (round cut)
white
 
light violet
5.33×3.55 mm 6×6 mm
actual size
Actual size of 0.4ct Diamond (baguette cut, 5.33×3.55mm, White color)   Actual size of 0.67ct Amethyst (round cut, 6×6mm, Light Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.4ct Diamond (baguette cut, 5.33×3.55mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Violet 0.67ct Amethyst (round cut, 6×6mm) 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
 22% vs 36%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.4ct Diamond Baguette (5.33×3.55mm, White) and 0.67ct Amethyst Round (6×6mm, Light Violet) 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.


0.4 Ct Diamond (Baguette) 0.67 Ct Amethyst (Round)
5.33×3.55 mm vs 6×6 mm
18.92 mm²   28.27 mm²
Face-up size outline for 0.67ct Amethyst (6×6mm, round cut)
Face-up size outline for 0.4ct Diamond (5.33×3.55mm, baguette cut)
0.4ct Diamond Baguette (5.33×3.55mm)
0.67ct Amethyst Round (6×6mm)
Difference: 49% (9.35 mm²)
0.67ct Amethyst (Round, 6×6mm) has approx. 49% more face-up area than 0.4ct Diamond (Baguette, 5.33×3.55mm).


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