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3ct Tanzanite (Round, 9.19×9.19mm, Blue) vs 3ct Emerald (Emerald, 10.5×7.78mm, Green)


Quick summary: When looked from above (face-up position), 3ct Emerald (10.5×7.78mm, emerald cut) appears 15% larger than 3ct Tanzanite (9.19×9.19mm, round cut). See below how they compare side-by-side on a ring and finger.

3ct Tanzanite (round cut)
vs
 3ct Emerald (emerald cut)
blue
 
green
9.19×9.19 mm 10.5×7.78 mm
actual size
Actual size of 3ct Tanzanite (round cut, 9.19×9.19mm, Blue color)   Actual size of 3ct Emerald (emerald cut, 10.5×7.78mm, Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 3ct Tanzanite (round cut, 9.19×9.19mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Green 3ct Emerald (emerald cut, 10.5×7.78mm) 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
 55% vs 47%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 3ct Tanzanite Round (9.19×9.19mm, Blue) and 3ct Emerald Emerald (10.5×7.78mm, 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, Tanzanite will face-up smaller than Emerald for a given carat weight, because it has higher specific gravity (3.35 vs. 2.72 - this means it's "heavier" compared to Emerald 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 Ct Tanzanite (Round) 3 Ct Emerald (Emerald)
9.19×9.19 mm vs 10.5×7.78 mm
66.33 mm²   75.97 mm²
Face-up size outline for 3ct Emerald (10.5×7.78mm, emerald cut)
Face-up size outline for 3ct Tanzanite (9.19×9.19mm, round cut)
3ct Tanzanite Round (9.19×9.19mm)
3ct Emerald Emerald (10.5×7.78mm)
Difference: 15% (9.64 mm²)
3ct Emerald (Emerald, 10.5×7.78mm) has approx. 15% more face-up area than 3ct Tanzanite (Round, 9.19×9.19mm).


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