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2.5ct Tanzanite (Emerald, 9.23×6.84mm, Blue) vs 2ct Diamond (Oval, 10.23×6.82mm, White)


Quick summary: When looked from above (face-up position), 2.5ct Tanzanite (9.23×6.84mm, emerald cut) appears 3% larger than 2ct Diamond (10.23×6.82mm, oval cut). See below how they compare side-by-side on a ring and finger.

2.5ct Tanzanite (emerald cut)
vs
 2ct Diamond (oval cut)
blue
 
white
9.23×6.84 mm 10.23×6.82 mm
actual size
Actual size of 2.5ct Tanzanite (emerald cut, 9.23×6.84mm, Blue color)   Actual size of 2ct Diamond (oval cut, 10.23×6.82mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2.5ct Tanzanite (emerald cut, 9.23×6.84mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 2ct Diamond (oval cut, 10.23×6.82mm) 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
 41% vs 41%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 2.5ct Tanzanite Emerald (9.23×6.84mm, Blue) and 2ct Diamond Oval (10.23×6.82mm, 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 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.


2.5 Ct Tanzanite (Emerald) 2 Ct Diamond (Oval)
9.23×6.84 mm vs 10.23×6.82 mm
58.71 mm²   57.21 mm²
Face-up size outline for 2.5ct Tanzanite (9.23×6.84mm, emerald cut)
Face-up size outline for 2ct Diamond (10.23×6.82mm, oval cut)
2.5ct Tanzanite Emerald (9.23×6.84mm)
2ct Diamond Oval (10.23×6.82mm)
Difference: 3% (1.5 mm²)
2.5ct Tanzanite (Emerald, 9.23×6.84mm) has approx. 3% more face-up area than 2ct Diamond (Oval, 10.23×6.82mm).


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