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3.5ct Tanzanite (Emerald, 10.34×7.66mm, Blue) vs 0.4ct Diamond (Cushion, 4.29×4.29mm, Purple)


Quick summary: When looked from above (face-up position), 3.5ct Tanzanite (10.34×7.66mm, emerald cut) appears 4.5 times larger than 0.4ct Colored Diamond (4.29×4.29mm, cushion cut). See below how they compare side-by-side on a ring and finger.

3.5ct Tanzanite (emerald cut)
vs
 0.4ct Diamond (cushion cut)
blue
 
purple
10.34×7.66 mm 4.29×4.29 mm
actual size
Actual size of 3.5ct Tanzanite (emerald cut, 10.34×7.66mm, Blue color)   Actual size of 0.4ct Diamond (cushion cut, 4.29×4.29mm, Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 3.5ct Tanzanite (emerald cut, 10.34×7.66mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Purple 0.4ct Diamond (cushion cut, 4.29×4.29mm) 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
 46% vs 26%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3.5ct Tanzanite Emerald (10.34×7.66mm, Blue) and 0.4ct Diamond Cushion (4.29×4.29mm, Purple) 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 Tanzanite for a given carat weight, because it has higher specific gravity (3.52 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.


3.5 Ct Tanzanite (Emerald) 0.4 Ct Colored Diamond (Cushion)
10.34×7.66 mm vs 4.29×4.29 mm
73.66 mm²   16.56 mm²
Face-up size outline for 3.5ct Tanzanite (10.34×7.66mm, emerald cut)
Face-up size outline for 0.4ct Diamond (4.29×4.29mm, cushion cut)
3.5ct Tanzanite Emerald (10.34×7.66mm)
0.4ct Colored Diamond Cushion (4.29×4.29mm)
Difference: 345% (57.1 mm²)
3.5ct Tanzanite (Emerald, 10.34×7.66mm) has approx. 345% more face-up area than 0.4ct Colored Diamond (Cushion, 4.29×4.29mm). In other words, it's 4.45x larger.


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